The MusicBrainz C Library by MusicBrainz is a client library to assist developers in creating MusicBrainz disc IDs and freedbs from audio CDs. The MusicBrainz database contains a huge amount of music metadata, which is maintained by the MusicBrainz community.
What's that song? If you're out and about, you might reach for your mobile phone's "name that tune" app, such as Shazam on iPhone. But if you're at your PC, it can be as easy as clicking over to the Audiggle app, which reports on sound from video, internet radio, or anything passing audio to your speakers.
Last December, Senzari launched the MusicGraph music recommendation and data access engine as well as the new MusicGraph API. Earlier this month, Senzari opened the MusicGraph API to the public, unveiling the API at the first-ever annual SXSW Music Hackathon Championship. Among the apps included in the list of overall grand prize finalists is Party Play which uses the MusicGraph API to create "a dynamic DJ for parties."