Showing posts with label free mp3. Show all posts
Showing posts with label free mp3. Show all posts

Friday, April 04, 2014

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Tuesday, November 06, 2012

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MP3

MPEG-1 Audio Layer 3 Filename extension .mp3
Internet media type audio/mpeg, audio/MPA, audio/mpa-robust
Type of format Audio
Standard(s) ISO/IEC 11172-3, ISO/IEC 13818-3
MPEG-1 Audio Layer 3, more commonly referred to as MP3, is a patented digital audio encoding format using a form of lossy data compression. It is a common audio format for consumer audio storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on digital audio players.

MP3 is an audio-specific format that was designed by the Moving Picture Experts Group as part of its MPEG-1 standard. The group was formed by several teams of engineers at Fraunhofer IIS in Erlangen, Germany, AT&T-Bell Labs (now a division of Alcatel-Lucent) in Murray Hill, NJ, USA, Thomson-Brandt, and CCETT as well as others. It was approved as an ISO/IEC standard in 1991.

The use in MP3 of a lossy compression algorithm is designed to greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners. An MP3 file that is created using the setting of 128 kbit/s will result in a file that is about 1/11th the size of the CD file created from the original audio source. An MP3 file can also be constructed at higher or lower bit rates, with higher or lower resulting quality.

The compression works by reducing accuracy of certain parts of sound that are deemed beyond the auditory resolution ability of most people. This method is commonly referred to as perceptual coding. It internally provides a representation of sound within a short-term time/frequency analysis window, by using psychoacoustic models to discard or reduce precision of components less audible to human hearing, and recording the remaining information in an efficient manner.

This technique is often presented as relatively conceptually similar to the principles used by JPEG, an image compression format. The specific algorithms, however, are rather different: JPEG uses a built-in vision model that is very widely tuned (as is necessary for images), while MP3 uses a complex, precise masking model that is much more signal dependent.


==Development==
The MP3 lossy audio data compression algorithm takes advantage of a perceptual limitation of human hearing called auditory masking. In 1894, Alfred Marshall Mayer reported that a tone could be rendered inaudible by another tone of lower frequency. In 1959, Richard Ehmer described a complete set of auditory curves regarding this phenomenon. Ernst Terhardt et al. created an algorithm describing auditory masking with high accuracy. This work added on a variety of reports from authors dating back to Fletcher, and to the work that initially determined critical ratios and critical bandwidths.

The psychoacoustic masking codec was first proposed in 1979, apparently independently, by Manfred R. Schroeder, et al. from AT&T-Bell Labs in Murray Hill, NJ, and M. A. Krasner both in the United States. Krasner was the first to publish and to produce hardware for speech, not usable as music bit compression, but the publication of his results as a relatively obscure Lincoln Laboratory Technical Report did not immediately influence the mainstream of psychoacoustic codec development. Manfred Schroeder was already a well-known and revered figure in the worldwide community of acoustical and electrical engineers, and his paper had influence in acoustic and source-coding (audio data compression) research. Both Krasner and Schroeder built upon the work performed by Eberhard F. Zwicker in the areas of tuning and masking of critical bands, that in turn built on the fundamental research in the area from Bell Labs of Harvey Fletcher and his collaborators. A wide variety of (mostly perceptual) audio compression algorithms were reported in IEEE's refereed Journal on Selected Areas in Communications. That journal reported in February 1988 on a wide range of established, working audio bit compression technologies, some of them using auditory masking as part of their fundamental design, and several showing real-time hardware implementations.

The immediate predecessors of MP3 were "Optimum Coding in the Frequency Domain" (OCF), and Perceptual Transform Coding (PXFM). These two codecs, along with block-switching contributions from Thomson-Brandt, were merged into a codec called ASPEC, which was submitted to MPEG, and which won the quality competition, but that was mistakenly rejected as too complex to implement. The first practical implementation of an audio perceptual coder (OCF) in hardware (Krasner's hardware was too cumbersome and slow for practical use), was an implementation of a psychoacoustic transform coder based on Motorola 56000 DSP chips.

MP3 is directly descended from OCF and PXFM. MP3 represents the outcome of the collaboration of Dr. Karlheinz Brandenburg, working as a postdoc at AT&T-Bell Labs with Mr. James D. Johnston of AT&T-Bell Labs, collaborating with the Fraunhofer Society for Integrated Circuits, Erlangen, with relatively minor contributions from the MP2 branch of psychoacoustic sub-band coders.

MPEG-1 Audio Layer 2 encoding began as the Digital Audio Broadcast (DAB) project managed by Egon Meier-Engelen of the Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt (later on called Deutsches Zentrum für Luft- und Raumfahrt, German Aerospace Center) in Germany. The European Community financed this project, commonly known as EU-147, from 1987 to 1994 as a part of the EUREKA research program.

As a doctoral student at Germany's University of Erlangen-Nuremberg, Karlheinz Brandenburg began working on digital music compression in the early 1980s, focusing on how people perceive music. He completed his doctoral work in 1989 and became an assistant professor at Erlangen-Nuremberg. While there, he continued to work on music compression with scientists at the Fraunhofer Society (in 1993 he joined the staff of the Fraunhofer Institute).

In 1991 there were two proposals available: Musicam and ASPEC (Adaptive Spectral Perceptual Entropy Coding). The Musicam technique, as proposed by Philips (The Netherlands), CCETT (France) and Institut für Rundfunktechnik (Germany) was chosen due to its simplicity and error robustness, as well as its low computational power associated with the encoding of high quality compressed audio. The Musicam format, based on sub-band coding, was the basis of the MPEG Audio compression format (sampling rates, structure of frames, headers, number of samples per frame).

Much of its technology and ideas were incorporated into the definition of ISO MPEG Audio Layer I and Layer II and the filter bank alone into Layer III (MP3) format as part of the computationally inefficient hybrid filter bank. Under the chairmanship of Professor Musmann (University of Hannover) the editing of the standard was made under the responsibilities of Leon van de Kerkhof (Layer I) and Gerhard Stoll (Layer II).

A working group consisting of Leon van de Kerkhof (The Netherlands), Gerhard Stoll (Germany), Leonardo Chiariglione (Italy), Yves-François Dehery (France), Karlheinz Brandenburg (Germany) and James D. Johnston (USA) took ideas from ASPEC, integrated the filter bank from Layer 2, added some of their own ideas and created MP3, which was designed to achieve the same quality at 128 kbit/s as MP2 at 192 kbit/s.

All algorithms were approved in 1991 and finalized in 1992 as part of MPEG-1, the first standard suite by MPEG, which resulted in the international standard ISO/IEC 11172-3, published in 1993. Further work on MPEG audio was finalized in 1994 as part of the second suite of MPEG standards, MPEG-2, more formally known as international standard ISO/IEC 13818-3, originally published in 1995. There is also MPEG-2.5 audio, a proprietary unofficial extension developed by Fraunhofer IIS. It enables MP3 to work satisfactorily at very low bitrates and added lower sampling frequencies.

Compression efficiency of encoders is typically defined by the bit rate, because compression ratio depends on the bit depth and sampling rate of the input signal. Nevertheless, compression ratios are often published. They may use the Compact Disc (CD) parameters as references (44.1 kHz, 2 channels at 16 bits per channel or 2×16 bit), or sometimes the Digital Audio Tape (DAT) SP parameters (48 kHz, 2×16 bit). Compression ratios with this latter reference are higher, which demonstrates the problem with use of the term compression ratio for lossy encoders.

Karlheinz Brandenburg used a CD recording of Suzanne Vega's song "Tom's Diner" to assess and refine the MP3 compression algorithm. This song was chosen because of its nearly monophonic nature and wide spectral content, making it easier to hear imperfections in the compression format during playbacks. Some jokingly refer to Suzanne Vega as "The mother of MP3". Some more critical audio excerpts (glockenspiel, triangle, accordion, etc.) were taken from the EBU V3/SQAM reference compact disc and have been used by professional sound engineers to assess the subjective quality of the MPEG Audio formats. This particular track has an interesting property in that the two channels are almost, but not completely, the same, leading to a case where Binaural Masking Level Depression causes spatial unmasking of noise artifacts unless the encoder properly recognizes the situation and applies corrections similar to those detailed in the MPEG-2 AAC psychoacoustic model.

==Going public==
A reference simulation software implementation, written in the C language and known as ISO 11172-5, was developed by the members of the ISO MPEG Audio committee in order to produce bit compliant MPEG Audio files (Layer 1, Layer 2, Layer 3). Working in non-real time on a number of operating systems, it was able to demonstrate the first real time hardware decoding (DSP based) of compressed audio. Some other real time implementation of MPEG Audio encoders were available for the purpose of digital broadcasting (radio DAB, television DVB) towards consumer receivers and set top boxes.

Later, on July 7, 1994, the Fraunhofer Society released the first software MP3 encoder called l3enc. The filename extension .mp3 was chosen by the Fraunhofer team on July 14, 1995 (previously, the files had been named .bit). With the first real-time software MP3 player Winplay3 (released September 9, 1995) many people were able to encode and play back MP3 files on their PCs. Because of the relatively small hard drives back in that time (~ 500 MB) lossy compression was essential to store non-instrument based (see tracker and MIDI) music for playback on computer.

==Internet==
From the first half of 1994 through the late 1990s, MP3 files began to spread on the Internet. The popularity of MP3s began to rise rapidly with the advent of Nullsoft's audio player Winamp (released in 1997), and the Unix audio player mpg123. In 1998, the Rio PMP300, one of the first portable MP3 players was released, despite legal suppression efforts by the RIAA.

In November 1997, the website mp3.com was offering thousands of MP3s created by independent artists for free. The small size of MP3 files enabled widespread peer-to-peer file sharing of music ripped from CDs, which would have previously been nearly impossible. The first large peer-to-peer filesharing network, Napster, was launched in 1999.

The ease of creating and sharing MP3s resulted in widespread copyright infringement. Major record companies argue that this free sharing of music reduces sales, and call it "music piracy". They reacted by pursuing lawsuits against Napster (which was eventually shut down and later sold) and against individual users who engaged in file sharing.

Despite the popularity of the MP3 format, online music retailers often use other proprietary formats that are encrypted or obfuscated in order to make it difficult to use purchased music files in ways not specifically authorized by the record companies. Attempting to control the use of files in this way is known as Digital Rights Management. Record companies argue that this is necessary to prevent the files from being made available on peer-to-peer file sharing networks. This has other side effects, though, such as preventing users from playing back their purchased music on different types of devices. However, the audio content of these files can usually be converted into an unencrypted format. For instance, users are often allowed to burn files to audio CD, which requires conversion to an unencrypted audio format.

Unauthorized MP3 file sharing continues on next-generation peer-to-peer networks. Some authorized services, such as Beatport, Bleep, Juno Records, eMusic, Zune Marketplace, Walmart.com, and Amazon.com sell unrestricted music in the MP3 format.

==Encoding audio==
The MPEG-1 standard does not include a precise specification for an MP3 encoder, but does provide example psychoacoustic models, rate loop, and the like in the non-normative part of the original standard. At the present, these suggested implementations are quite dated. Implementers of the standard were supposed to devise their own algorithms suitable for removing parts of the information from the audio input. As a result, there are many different MP3 encoders available, each producing files of differing quality. Comparisons are widely available, so it is easy for a prospective user of an encoder to research the best choice. It must be kept in mind that an encoder that is proficient at encoding at higher bit rates (such as LAME) is not necessarily as good at lower bit rates.

During encoding, 576 time-domain samples are taken and are transformed to 576 frequency-domain samples. If there is a transient, 192 samples are taken instead of 576. This is done to limit the temporal spread of quantization noise accompanying the transient. (See psychoacoustics.)

==Decoding audio==
Decoding, on the other hand, is carefully defined in the standard. Most decoders are "bitstream compliant", which means that the decompressed output - that they produce from a given MP3 file - will be the same, within a specified degree of rounding tolerance, as the output specified mathematically in the ISO/IEC standard document (ISO/IEC 11172-3). Therefore, comparison of decoders is usually based on how computationally efficient they are (i.e., how much memory or CPU time they use in the decoding process).

==Audio quality==
When performing lossy audio encoding, such as creating an MP3 file, there is a trade-off between the amount of space used and the sound quality of the result. Typically, the creator is allowed to set a bit rate, which specifies how many kilobits the file may use per second of audio. Using a lower bit rate provides a relatively lower audio quality and produces a smaller file size. Likewise, using a higher bit rate outputs a higher quality audio, but also results in a larger file.

Files encoded with a lower bit rate will generally play back at a lower quality. With too low a bit rate, compression artifacts (i.e. sounds that were not present in the original recording) may be audible in the reproduction. Some audio is hard to compress because of its randomness and sharp attacks. When this type of audio is compressed, artifacts such as ringing or pre-echo are usually heard. A sample of applause compressed with a relatively low bit rate provides a good example of compression artifacts.

Besides the bit rate of an encoded piece of audio, the quality of MP3 files also depends on the quality of the encoder itself, and the difficulty of the signal being encoded. As the MP3 standard allows quite a bit of freedom with encoding algorithms, different encoders may feature quite different quality, even with identical bit rates. As an example, in a public listening test featuring two different MP3 encoders at about 128 kbit/s, one scored 3.66 on a 1–5 scale, while the other scored only 2.22.

Quality is dependent on the choice of encoder and encoding parameters. However, in 1998, MP3 at 128 kbit/s was providing quality only equivalent to AAC at 64 kbit/s and MP2 at 192 kbit/s.

The simplest type of MP3 file uses one bit rate for the entire file — this is known as Constant Bit Rate (CBR) encoding. Using a constant bit rate makes encoding simpler and faster. However, it is also possible to create files where the bit rate changes throughout the file. These are known as Variable Bit Rate (VBR) files. The idea behind this is that, in any piece of audio, some parts will be much easier to compress, such as silence or music containing only a few instruments, while others will be more difficult to compress. So, the overall quality of the file may be increased by using a lower bit rate for the less complex passages and a higher one for the more complex parts. With some encoders, it is possible to specify a given quality, and the encoder will vary the bit rate accordingly. Users who know a particular "quality setting" that is transparent to their ears can use this value when encoding all of their music, and not need to worry about performing personal listening tests on each piece of music to determine the correct bit rate.

Perceived quality can be influenced by listening environment (ambient noise), listener attention, and listener training and in most cases by listener audio equipment (such as sound cards, speakers and headphones).

A test given to new students by Stanford University Music Professor Jonathan Berger showed that student preference for MP3 quality music has risen each year. Berger said the students seem to prefer the 'sizzle' sounds that MP3s bring to music. Others have reached the same conclusion, and some record producers have begun to mix music specifically to be heard on iPods and mobile phones.

==Bit rate==
Several bit rates are specified in the MPEG-1 Audio Layer III standard: 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256 and 320 kbit/s, and the available sampling frequencies are 32, 44.1 and 48 kHz.[21] Additional extensions were defined in MPEG-2 Audio Layer III: bit rates 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 kbit/s and sampling frequencies 16, 22.05 and 24 kHz.

A sample rate of 44.1 kHz is almost always used, because this is also used for CD audio, the main source used for creating MP3 files. A greater variety of bit rates are used on the Internet. 128 kbit/s is the most common, offering adequate audio quality in a relatively small space. As Internet bandwidth availability and hard drive sizes have increased, higher bit rates like 160 and 192 kbit/s have increased in popularity.

Uncompressed audio as stored on an audio-CD has a bit rate of 1,411.2 kbit/s, so the bitrates 128, 160 and 192 kbit/s represent compression ratios of approximately 11:1, 9:1 and 7:1 respectively.

Non-standard bit rates up to 640 kbit/s can be achieved with the LAME encoder and the freeformat option, although few MP3 players can play those files. According to the ISO standard, decoders are only required to be able to decode streams up to 320 kbit/s.

==VBR==
MPEG audio may use variable bitrate (VBR). Layer III can use bitrate switching and bit reservoir. Variable bitrate is used when the goal is to achieve a fixed level of quality. The final file size of a VBR encoding is less predictable than with constant bitrate. Average bitrate is a compromise between the two - the bitrate is allowed to vary for more consistent quality, but is controlled to remain near an average value chosen by the user, for predictable file sizes. Although technically an MP3 decoder must support VBR to be standards compliant, historically some decoders have bugs with VBR decoding, particularly before VBR encoders became widespread.

==File structure==

An MP3 file is made up of multiple MP3 frames, which consist of a header and a data block. This sequence of frames is called an elementary stream. Frames are not independent items ("byte reservoir") and therefore cannot be extracted on arbitrary frame boundaries. The MP3 Data blocks contain the (compressed) audio information in terms of frequencies and amplitudes. The diagram shows that the MP3 Header consists of a sync word, which is used to identify the beginning of a valid frame. This is followed by a bit indicating that this is the MPEG standard and two bits that indicate that layer 3 is used; hence MPEG-1 Audio Layer 3 or MP3. After this, the values will differ, depending on the MP3 file. ISO/IEC 11172-3 defines the range of values for each section of the header along with the specification of the header. Most MP3 files today contain ID3 metadata, which precedes or follows the MP3 frames; as noted in the diagram.

==Design limitations==
 This section does not cite any references or sources.
Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (July 2008)

There are several limitations inherent to the MP3 format that cannot be overcome by any MP3 encoder. Newer audio compression formats such as Vorbis, WMA Pro and AAC no longer have these limitations. In technical terms, MP3 is limited in the following ways:

Time resolution can be too low for highly transient signals and may cause smearing of percussive sounds.
Due to the tree structure of the filter bank, pre-echo problems are made worse, as the combined impulse response of the two filter banks does not, and cannot, provide an optimum solution in time/frequency resolution.
The combining of the two filter banks' outputs creates aliasing problems that must be handled partially by the "aliasing compensation" stage; however, that creates excess energy to be coded in the frequency domain, thereby decreasing coding efficiency.
Frequency resolution is limited by the small long block window size, which decreases coding efficiency.
There is no scale factor band for frequencies above 15.5/15.8 kHz.
Joint stereo is done only on a frame-to-frame basis.
Internal handling of the bit reservoir increases encoding delay.
Encoder/decoder overall delay is not defined, which means there is no official provision for gapless playback. However, some encoders such as LAME can attach additional metadata that will allow players that can handle it to deliver seamless playback.
The data stream can contain an optional checksum, but the checksum only protects the header data, not the audio data.

==ID3 and other tags==
Main articles: ID3 and APEv2 tag
A "tag" in an audio file is a section of the file that contains metadata such as the title, artist, album, track number or other information about the file's contents.

As of 2006, the most widespread standard tag formats are ID3v1 and ID3v2, and the more recently introduced APEv2.

APEv2 was originally developed for the MPC file format. APEv2 can coexist with ID3 tags in the same file or it can be used by itself.

Tag editing functionality is often built into MP3 players and editors, but there also exist tag editors dedicated to the purpose.

==Volume normalization==
Since volume levels of different audio sources can vary greatly, it is sometimes desirable to adjust the playback volume of audio files such that a consistent average volume is perceived. The idea is to control the average volume across multiple files, not the volume peaks in a single file. This gain normalization, while similar in purpose, is distinct from dynamic range compression (DRC), which is a form of normalization used in audio mastering. Gain normalization may defeat the intent of recording artists and audio engineers who deliberately set the volume levels of the audio they recorded.

A few standards for storing the average volume of an MP3 file in its metadata tags, enabling a specially designed player to automatically adjust the overall playback volume for each file, have been proposed. A popular and widely implemented such proposal is "Replay Gain", which is not MP3-specific. When used in MP3s, it is stored differently by different encoders, and as of 2008, Replay Gain-aware players don't yet support all formats.

==Licensing and patent issues==
 This section may require cleanup to meet Wikipedia's quality standards. Please improve this section if you can. (November 2008)

Many organizations have claimed ownership of patents related to MP3 decoding or encoding. These claims have led to a number of legal threats and actions from a variety of sources, resulting in uncertainty about which patents must be licensed in order to create MP3 products without committing patent infringement in countries that allow software patents.

The various MP3-related patents expire on dates ranging from 2007 to 2017 in the U.S. The initial near-complete MPEG-1 standard (parts 1, 2 and 3) was publicly available in December 6, 1991 as ISO CD 11172. In the United States, patents cannot claim inventions that were already publicly disclosed by the inventor more than a year prior to the filing date, but for patents filed prior to June 8, 1995, submarine patents made it possible to extend the effective lifetime of a patent through application extensions. Patents filed for anything disclosed in ISO CD 11172 a year or more after its publication are questionable; if only the known MP3 patents filed by December 1992 are considered MP3 decoding, then MP3 may be patent free in the US by December of 2012.

Thomson Consumer Electronics claims to control MP3 licensing of the Layer 3 patents in many countries, including the United States, Japan, Canada and EU countries. Thomson has been actively enforcing these patents.

MP3 license revenues generated about €100 million for the Fraunhofer Society in 2005.

In September 1998, the Fraunhofer Institute sent a letter to several developers of MP3 software stating that a license was required to "distribute and/or sell decoders and/or encoders". The letter claimed that unlicensed products "infringe the patent rights of Fraunhofer and Thomson. To make, sell and/or distribute products using the [MPEG Layer-3] standard and thus our patents, you need to obtain a license under these patents from us."

However, there exist both free and/or proprietary alternatives, with free formats such as Vorbis, AAC, and others. Microsoft's usage of its own proprietary Windows Media format allows it to avoid licensing issues associated with these patents by avoiding usage of the MP3 format entirely. Until the key patents expire, unlicensed encoders and players could be infringing in countries where the patents are valid.

In spite of the patent restrictions, the perpetuation of the MP3 format continues. The reasons for this appear to be the network effects caused by:

familiarity with the format,
the large quantity of music now available in the MP3 format,
the wide variety of existing software and hardware that takes advantage of the file format,
the lack of DRM restrictions, which makes MP3 files easy to edit, copy and play in different portable digital players (Samsung, Apple, Creative, etc.),
the majority of home users not knowing or not caring about the patents' controversy and often not considering such legal issues when choosing their music format for personal use.
Additionally, patent holders declined to enforce license fees on free and open source decoders, which allows many free MP3 decoders to develop. Thus, while patent fees have been an issue for companies that attempt to use MP3, they have not meaningfully impacted users, which allows the format to grow in popularity.

Sisvel S.p.A. and its U.S. subsidiary Audio MPEG, Inc. previously sued Thomson for patent infringement on MP3 technology, but those disputes were resolved in November 2005 with Sisvel granting Thomson a license to their patents. Motorola also recently signed with Audio MPEG to license MP3-related patents.

In September 2006, German officials seized MP3 players from SanDisk's booth at the IFA show in Berlin after an Italian patents firm won an injunction on behalf of Sisvel against SanDisk in a dispute over licensing rights. The injunction was later reversed by a Berlin judge, but that reversal was in turn blocked the same day by another judge from the same court, "bringing the Patent Wild West to Germany" in the words of one commentator.

On February 16, 2007, Texas MP3 Technologies sued Apple, Samsung Electronics and Sandisk with a patent-infringement lawsuit regarding portable MP3 players. The suit was filed in Marshall, Texas; this is a common location for patent infringement suits due to the speed at which trials are conducted there.

Texas MP3 Technologies claimed infringement with U.S. patent 7,065,417, awarded in June 2006 to multimedia chip-maker SigmaTel, covering "an MPEG portable sound reproducing system and a method for reproducing sound data compressed using the MPEG method."

Alcatel-Lucent also claims ownership of several patents relating to MP3 encoding and compression, inherited from AT&T-Bell Labs. In November 2006 (prior to the companies' merger), Alcatel filed a lawsuit against Microsoft (see Alcatel-Lucent v. Microsoft), alleging infringement of seven of its patents. On February 23, 2007, a San Diego jury awarded Alcatel-Lucent a record-breaking US$1.52 billion in damages. The judge, however, reversed the jury verdict and ruled for Microsoft, and this ruling was upheld by the court of appeals. The appeals court actually ruled that Fraunhofer was a co-owner of one patent claimed to be owned by Alcatel-Lucent, due to work by James D. Johnston while Dr. Brandenburg worked at AT&T.

In short, with Thomson, Fraunhofer IIS, Sisvel (and its U.S. subsidiary Audio MPEG), Texas MP3 Technologies, and Alcatel-Lucent all claiming legal control of relevant MP3 patents related to decoders, the legal status of MP3 remains unclear in countries where those patents are valid.

==Security issues==
Microsoft Windows Media Format Runtime in Windows 2000, Windows XP, Windows Vista and Windows Server contained a coding error that permitted "remote code execution if a user opened a specially crafted media file". Such a file would allow the attacker to "then install programs; view, change, or delete data; or create new accounts with full user rights", if the account on which the file was played had administrator privileges. The problem was addressed in a critical update issued on September 8, 2009 (KB968816).

==Alternative technologies==
Main article: List of codecs
Many other lossy and lossless audio codecs exist. Among these, mp3PRO, AAC, and MP2 are all members of the same technological family as MP3 and depend on roughly similar psychoacoustic models. The Fraunhofer Gesellschaft owns many of the basic patents underlying these codecs as well, with others held by Dolby Labs, Sony, Thomson Consumer Electronics, and AT&T. In addition, there is also the open source file format Ogg Vorbis that has been available free of charge and without patent restrictions.

==See also==
Audio compression (data)
Comparison of audio codecs
Copyright infringement
Digital audio player
ID3
Joint stereo
LRC (file format)
Media player
MP3 blog
MP3 Surround
Streaming Media
DJ digital controller
AAC
Ogg Vorbis



Free Music & Music Download

A music download is the transferral of a song from an Internet-facing computer or website to a user's local computer. This term encompasses both legal downloads and downloads of copyright material without permission or payment.
Popular examples of online music stores that sell digital singles and albums include the iTunes Store, Napster, Zune Marketplace, Amazon MP3, Nokia Music Store, TuneTribe, Kazaa and eMusic. Paid downloads are sometimes encoded with Digital Rights Management that restricts making extra copies of the music or playing purchased songs on certain digital audio players. They are almost always compressed using a lossy codec (usually MPEG-1 Layer 3 or Windows Media), reducing file size and therefore bandwidth requirements.
However, this may cause an apparent loss in quality to a listener when compared to a CD, and cause compatibility issues with certain software and devices. Uncompressed files and losslessly compressed files are available at some sites.
As of 2006, digital music sales are estimated to have reached a trade value of approximately US$2 billion, with tracks available through 500 online services located in 40 countries, representing around 10 percent of the total global music market. Around the world in 2006, an estimated five billion songs, equating to 38,000 years in music, were swapped on peer-to-peer websites, while 509 million were purchased online. As of January 2011, Apple's iTunes Store alone saw $1.1 billion of revenue in fiscal Q1.

Music downloads offered by artists
Some artists allow their songs to be downloaded ( FREE ) directly from their websites. This is the case. So do it for free.

Challenges to legal music downloads
Even legal music downloads have faced a number of challenges from artists, record labels and the Recording Industry Association of America. In July 2007, the Universal Music Group decided not to renew their long-term contracts with iTunes. This legal challenge was primarily based upon the issue of pricing of songs, as Universal wanted to be able to charge more or less depending on the artist, a shift away from iTunes' standard 99 cents per song pricing. Many industry leaders feel that this is only the first of many show-downs between Apple Inc. and the various record labels.

Tuesday, January 31, 2012

CALCINHA VERMELHA : Free Music

CALCINHA VERMELHA Free Music 


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CALCINHA VERMELHA & Free Music


CALCINHA VERMELHA
( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 258450
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-calcinha-vermelha/


( Chorus )
Vermelha, Calcinha vermelha ah uuhhh...
Vermelha, Calcinha vermelha
Vermelha, Calcinha vermelha

Eh voce, onde vai nessa estrada sozinha ?
Por certo vai levar doce pra vovozinha...
Com esse andar saltitante e essa saia curtinha
Ah ! Eu nao pude evitar de ver sua calcinha..

Calcinha vermelha, vermelha

Esse lobo nao e mais aquele que quer so comer vovozinha
Mudou o fim dessa historia agora e a vez de papar a netinha

Calcinha vermelha, ah uuhhh...vermelha

Esses olhos tao grandes querendo te devorar
Essa boca enorme querendo te beijar
Esses bracos enormes querendo te agarrar
Tudo em mim fica enorme querendo te amar

Calcinha vermelha, vermelha

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GLORIA AO SENHOR : Free Music

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GLORIA AO SENHOR
( Letra e Musica by Nelio Guerson & Carlos Guerson )
(P) 1996 All Rights Reserved SR 356371
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-gloria-ao-senhor/


( Chorus )
Gloria ao Senhor
Estou aqui pra louvar teu nome Santo
Gloria ao Senhor
Estou aqui pra louvar teu nome Santo

Fecho os meus olhos, abro o meu coracao
E deixo entrar a tua luz
E atraves da oracao eu me entrego a ti Jesus

( Chorus )

Tua palavra toca fundo o meu ser
Me faz sentir a tua mao
Tao grandioso e teu poder de justica e protecao

( Chorus )

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LOUCO POR UMA MULHER : Free Music

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LOUCO POR UMA MULHER
( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 113616
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-louco-por-uma-mulher/


Eu vou lhe dizer o que faz um homem ficar
Louco por uma mulher
O jeito dela ser e de me desejar
O modo como ela me quer

O olhar e o que mais me desperta atencao
Desperta atencao
Eu vou lhe dizer tudinho nesta cancao
Nesta cancao

Um ar bem feminino no jeito de falar
E no modo de agir
A coragem em tudo no modo de pensar
No modo dela se vestir

Um jeitao especial
Que nao e comum, que nao e comum
E um olhar bem sensual
E um  bonito bum bum ....e um bonito bum bum


TAGS: nelio, guerson, carlos, free, music, download, mp3, musica, gratis, musik, musique, singer, songwriter, brasil, brazil, brazilian, mulher, bonito, bum, feminino, cancao, ela, sensual, homem, top hit, cool, cool music, good, love, hit, pop, rock, brasileira, brasilien, bresil, free music, free, music, music download, download, free mp3, mp3, mp3 download, download music, google music,


LOUCO POR VOCE : Free Music

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LOUCO POR VOCE
( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 113616
FREE MP3 MUSIC DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-louco-por-voce/


Eu sou louco
Louco por voce
Eu sou doidao
Doidao ate demais
Doidao por voce

Eu me rendo sou mesmo louco por voce
Nao da mesmo pra resistir, nao sei porque
Eu sou louco sou mesmo louco por voce
Nao da mais p'ra aguentar sem te dizer
Que amor ! Sem ti nao sei viver...
( bis )


To tocando violao
Pensando em voce
E nem presto atencao no que vou fazer
Se alguem entao me chama eu fico sem responder


Eu sou louco
Louco por voce
Eu sou doidao
Doidao ate demais
Doidao por voce

( Solo )


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OME E NET TON : Free Music

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OME E NET TON 
( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 113616
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-ome-net-ton/



Oh - Oh oh oh - oh oh oh - oh oh oh
ome e net ton
ome e net ton
ome e net ton


Wich ton oig odo na
Aouf, ni kul mia revuo si mieg ed
Roos, ni gnieb aouf ui mielb tnod ya
Hofib, ted did hui
Hurt ehdm im duort hoven ui
Ome e net ton
Uigd vol ya red, ies ut sui ya

( solo )

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MAGIC MUSIC WITH PRELUDE : Free Music

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MAGIC MUSIC WITH PRELUDE
( Letra e Musica By Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 200441
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-magic-music-with-prelude/


( Prelude )
This kind of magic is you, it's me...

This Magic Music
Comes to take care of me
And every one can see
How much it means to me
This kind of magic
Comes down to shine on me
This magic music is good to me

Magical mistery
Part of you part of me
Magical song for us
A delight for all of us
This magic music
Comes down to enlighten me
This kind of magic is you, it's me

Magical mistery
Part of you part of me
Magical song for us
A delight for all of us
This magic music
Comes down to light on me
This kind of magic is you. It's me


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AMERICAN SAMBA : Free Music

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AMERICAN SAMBA

( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 200441
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-american-samba/


I don't know why she went and hurt me so
Maybe she hates my Rock and Roll
The more I learn the less I know

I'm waiting for another day
I know that she'll regret it someday
I'm not okay or I should say
Somebody hid the light of day

You know that I'm not feeling so okay
I've lost my friend she's far away
But she'll be back someday
I don't know why she went and hurt me so
Maybe she hates my Rock and Roll
The more I learn the less I know

I'm waiting for another day
I know that she'll regret it someday
I'm not okay or I should say
Somebody hid the light of day

( solo )

You know that I'm not feeling so okay
I've lost my friend she's far away
But she'll be back someday
I don't know why she went and hurt me so
Maybe she hates my Rock...I say
The more I learn the...
Hey Hey Hey Hey

I'm waiting for another day
I know that she'll regret it someday
I'm not okay or I should say
Somebody hid the light of day

I'm waiting for another day
I know that she'll regret it someday - ihhhh
Listen to my
American Samba
American Samba
American Samba
American Samba

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HOLD ME TIGHT : Free Music

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HOLD ME TIGHT

( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 356371 and SR 187449
FREE MP3 MUSIC DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-hold-metight/


( Prelude )

I need your care  ( oh )
I need your love  ( oh )
Hold me tight     ( oh )
All right         ( oh )

Love me forever   ( oh )
Love me whenever  ( oh )
You hold me tight ( oh )
All right         ( oh )

When I feel you in my lips  ( tchu tchu ru ru..x 2)
In the nick of time I sigh  ( tchu tchu ru ru..x 2)
And enjoy your special kiss ( tchu tchu ru ru..x 2)
Special kiss for you and I  ( tchu tchu ru ru..x 2)
( Bis )

Hold me tight ( ti ti ti ti ti ahh )
All right     ( ti ti ti ti ti ahh )
Hold me tight ( ti ti ti ti ti ahh )
All right

I need your care  ( ti ti ahh )
I need your love  ( ti ti ahh )
Hold me tight     ( ti ti ahh )  
All right         ( ti ti ahh )

Love me forever   ( ti ti ahh )
Love me whenever  ( ti ti ahh )
You hold me tight ( ti ti ahh )
All right         ( ti ti ahh )

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NOT ANY MORE : Free Music

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NOT ANY MORE Free Music

NOT ANY MORE
( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 113616
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-not-any-more/


CHORUS
Not any more, not any more, not any more

I used to say that I loved you
Not any More
You never told me the truth
You did that before

I don't blame you for being sore
The game is over I'm looking for another girl
Not you...Not any more
Not any more
Not any more


TAGS : nelio, guerson, carlos, free, music, download, mp3, musica, gratis, musik, musique, singer, songwriter, brasil, brazil, brazilian, chorus, not, any, more, loved, blame, another, girl, top hits, top hit, cool, cool music, good, love, hit, pop, rock, top hit, cool, cool music, good, love, hit, pop, rock, brasileira, brasilien, bresil, free music, free, music, music download, download, free mp3, mp3, mp3 download, download music, google music,



YOU ARE GOING TO FIND ME : Free Music

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YOU ARE GOING TO FIND ME
( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 113616
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-youre-going-to-find-me/


You're going to find... find me
And you will be always with me
You're going to find... find me
See me feel me

You're going to find... find me
And you will leave another for me
You're going to find... find me
See me feel me

You're going to find... find me
And you will leave another for me
You're going to find... find me
You will see !

( Solo )

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Free Music : UFO

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UFO
( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 113616
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-ufo/


UFO in the sky
Searching for us to say... Hi
Don't ask me why baby
Don't ask me why baby
Don't ask me why baby
If they came from the stars
Maybe Venus or Mars

I'm just waiting for a sign
They are on my mind
( bis )

UFO in the sky blue
Searching for us to say... Hi, too
A sign from Space
A light from Pulsars
From giant stars
Rambling through the skies
Distant from my eyes

The brilliant Morning Star
Is near my heart
( bis )

A sign from Space
A light from Pulsars
A sign from Space
A light from Pulsars

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HAPPY BIRTHDAY : Free Music

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HAPPY BIRTHDAY
( Words and Music by Nelio Guerson & Carlos Guerson )
(P) 1990 All Rights Reserved SR 187449
FREE MUSIC MP3 DOWNLOAD Direct From Artist
http://palcomp3.com/nelioguerson/mp3-happy-birthday/


Happy Birthday
Happy Birthday to you

Happy Birthday
Happy Birthday to you

Happy Birthday
Happy Birthday to you uh uh uh uh uh

Happy Birthday
Happy Birthday to you

( Repeat x 2 )

La ra ra
La la ra ra - la ra ra
La ra ra
La la ra ra - la ra ra
La ra ra - la la ra ra
Happy Birthday
Happy Birthday to you uh uh uh uh uh
Happy Birthday
Happy Birthday to you

TAGS: nelio, guerson, carlos, free, music, download, mp3, musica, gratis, musik, musique, singer, songwriter, brasil, brazil, brazilian, happy, birthday, to, you, la, ra, repeat, uh, top hit, cool, cool music, good, love, hit, pop, rock, brasileira, brasilien, bresil, free music, free, music, music download, download, free mp3, mp3, mp3 download, download music, google music,