MusicBrainz

• is a user-maintained community music metadatabase:
  MusicBrainz provides a catalog of music metadata such as the artist name, the release title, and the list of tracks that appear on a release. Since 2005, users have the option to further relate each of these entities using a detailed set of relationships (i.e. who played which instrument on a release/track). MusicBrainz only provides the data about the music and not the music itself. MusicBrainz does not condone copyright infringement and thus cannot help you find the best place to illegally download copyrighted works. Learn more about MusicBrainz...

• provides solutions to identifiy and label digital music files:
  The MusicBrainz products for identifying and labelling digital music files are the MusicBrainzTagger, iEatBrainz, and the PicardTagger — Windows, MacOS X, and Python applications that use AcousticFingerprints (TRMs and PUIDs) to semi-automatically identify tracks in your music collection and then write consistent and accurate metadata to your music files.

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