CDDB

Compact Disc Database.

An online lookup tool for retrieving album, artist, and track information, especially helpful for completing MP3 ID3 tags.

CDDB was designed around the task of identifying entire CDs, not merely single tracks. Since identification of CDs is based on the length and order of the tracks, CDDB cannot identify playlists in which the order of tracks has been changed, or compilations of tracks from different CDs.