This is a site dedicated to compiling a massive music database. Information about songs, artists, and producers can be found here. They even keep track of relationships between artists!

MusicBrainz can identify music without ID3 tags or any extra information. It does this by taking an "acoustic fingerprint" - a small piece of data that represents an entire song - of the music it is analyzing, then comparing it with a database of known fingerprints. While this technique is very good at identifying published recorded music (songs you download from iTunes or buy on a CD), keep in mind that it will not work at all on live music.

MusicBrainz is free. There is a sample application on their website that identifies music, the "Magic MP3 Tagger," but it is also built-in to other music applications.

Also, if you have an iPhone, consider the "Shazam" application; it identifies recorded music in a similar manner.

Links to both MusicBrainz and Shazam are included in the related links.

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