Service for identifying an un-tagged mp3

Question

Is there an open source service that I can call from a program, where it passes information about a un-tagged mp3, and it responds with details about the song(e.g. artist, album, track, etc.)? If not, is there an alternative I can use to identify songs?

Answer 1

MusicBrainz is one that works pretty well. It uses an "acoustic fingerprint" to look up potential matches.

Answer 2

AcoustID is an open source fingerprint system that matches fingerprints with data from MusicBrainz

See http://musicbrainz.org/doc/Fingerprinting for details and a list of other figerprinting systems.