Music IP
Service to identify musical tracks. ("a global search engine for music")
URL = http://www.musicip.com
The service includes a database of 26 million fingerprinted audio tracks. The public domain track metadata from MusicBrainz returned by MusicDNS can be used freely for any applications by developers, organizations or enterprises.
Commentary
Boing Boing calls it the free and open alternative to Gracenotes. MusicIP belongs to the MusicBrainz Foundation. It's a content identification service.
"MusicIP's free service joins a market that includes the commercially available offering from Gracenote, whose CDDB music identification database is the standard used by most media players, including iTunes. Other applications include All Media Guide's commercially available AMG LASSO, and the open-source freedb." (http://www.dmwmedia.com/news/2007/01/11/musicip-challenges-gracenote-with-free-music-identification-service)
More Information
Competitor of Gracenote
Commentary at http://www.dmwmedia.com/news/2007/01/11/musicip-challenges-gracenote-with-free-music-identification-service