Gracenote SDK (GNSDK) is the core software platform that delivers all of Gracenote’s recognition, metadata and discovery features to applications running on a wide range of operating systems and architectures. (And YES, that includes SDK for mobile devices.)
What's available: playlisting, recommendation, track/album metadata and much more!
The Gracenote Rhythm APIs provide adaptive radio and music recommendation features in a convenient Web service.
What's available: adaptive playlist, recommendation using seed track/artist/genre/era