] MusicBrainz also takes this concept one step further in
] applying it to digital audio files like MP3 files and Ogg
] Vorbis files. The metadata contained in these files is
] often incorrect or missing altogether. If this data is
] not present or correct, it makes it difficult for users
] to find the music they wish to play. 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.

I believe some of us were having a conversation about needing something liek this integrated into BitTorrent while at Phreaknic 8.

MusicBrainz - Music Identifier