The MusicBrainz (libmusicbrainz-objc) Objective-C Library by Joachim Brandon LeBlanc is an iOS Library for the MusicBrainz Web Service. The MusicBrainz database contains a huge amount of music metadata, which is maintained by the MusicBrainz community.
Expect a mash pit, not a mosh pit, at this weekend's Music Hack Day in London. Over 200 people will come together from the UK and across Europe for what the organizers call "the best industry to hack on, with the cleanest APIs and the most enjoyable content."
Yes.com is a unique community-oriented music site that provides real-time and historical information about songs played on United States terrestrial radio stations. Besides this up-to-the-minute database, Yes has social features like chat rooms for specific radio stations or for a specific artists, like the Yes.com Pink Floyd page showing which radio stations are currently playing or recently played Pink Floyd songs. In addition they also offer an API that developers can build on (our Yes API profile).