The Decibel C# SDK allows developers to query the Decibel API to return music metadata. Calls to the Decibel API are made through query objects, which take care of all the logic involved in running a REST query, including deserializing the results to handy result objects.
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.
AudioBoo brings the familiar tape-recorder type interface to the web with all the fixings. Take your audio recording, add a picture, a location, put it in a social context, throw in popularity ratings and you have AudioBoo. The simplicity and social aspects of this service make a great platform for podcasters while providing another avenue of media discovery for users. But it's new and still changing. If you're feeling like an adventurous explorer, ready for twists, turns and surprises, jump on in to the AudioBoo API.