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.
Previously set to go away today, using the Twitter API with basic authentication will instead be phased out over the next two weeks. During that time, any application still using the older method should switch to OAuth, which has been the preferred method for some time.