iTunes is by far the most popular mp3 site, for music and videos. You can download free mp3s, and also purchase mp3s from iTunes. The website is http://www.itunes.com.
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That just depends on your personal preference, but a popular website for mp3's is http://www.emusic.com/ It has a trial and they have inexpensive songs after that.
Most mp3 file sharing sites. Bee mp3 is the best site for downloads.
The most popular place to purchase music in MP3 format is the iTunes website. MP3 music files can also be bought from Amazon. Walmart did offer this service but have recently discontinued it.
There are literally hundreds of types of music formats. The most popular are wave, aiff, mp3, flac and OGG.
Kohit is an MP3 download site. They offer a large selection of MP3's, ranging from old to new. They also have popular music, such as Bruno Mars "The Lazy Song".
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Popular Bollywood music may be found on "India MP3". They currently offer free downloads. Care must be used when downloading from any site to prevent virus and malware issues.
It depends upon which mp3 music site you are talking about but I assume you mean a site which sells mp3s like iTunes. Using these websites allows you to buy specific songs or albums for a set price and then play them on your devices.
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There are none it is illegal
4Shared is a popular MP3 download app for Android. Another is Music Download Paradise.