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freedb is a database to look up CD information using the internet. This is done by a client (a freedb aware application) which calculates a (nearly) unique disc ID for a CD in your CD-Rom and then queries the database. As a result, the client displays the artist, CD-title, tracklist and some additional info.

MusicBrainz est une encyclopédie musicale libre qui collecte des métadonnées musicales et les propose au public.