The Songkick NodeJS SDK by Andrew Schneider allows integration with Songkick's live music database with features such as band tracking, and personalized alerts. The SDK offers the ability to go over the API's 50 result per page limit. The current version is 1.0.2.
Stereomood is a streaming music service that gives recommendations. To start, it uses a list of moods, each of which have an associated playlist. While playing songs, users can like or ban songs, much like Last.fm or Pandora. The Stereomood API allows full access to the site's functionality to developers, allowing developers to make fully usable clients on any platform.