Welcome to MusicBrainz, “a community music metadatabase that attempts to create a comprehensive music information site. You can use the MusicBrainz data either by browsing this web site, or you can access the data from a client program — for example, a CD player program can use MusicBrainz to identify CDs and provide information about the CD, about the artist or about related information. You can also use the MusicBrainz Tagger to automatically identify and clean up the metadata tags in your MP3 collections….

Many MP3 lovers have a huge collection of MP3 files but often have a hard time finding the music to which they want to listen. The MusicBrainz solution for this is the MusicBrainz Tagger, a Windows application that uses acoustic fingerprints (TRMs) to semiautomatically identify tracks in your music collection and then write clean and accurate metadata to your music files.” [There is also a Mac version.]