The Echo Nest API, a suite of web services for music search and recommendations, officially launched at DEMOfall08. As they say: " Input any song and get an XML description of its content." It's a very intriguing API that's increasingly attracting the notice of the developer community. Paul Lamere exemplifies the excitement Echo Nest is eliciting in his recent Sun blogs post "The Echo Nest Developer's API.
Something awesome is happening in the world of music and the web. But first, some primer.
Rdio is one of the few music subscription services that do a tremendous amount of things right, including having its robust Rdio API. For $5 a month, you can get all of the music you want, have collaborative playlists, share content to Facebook and Twitter, and keep up with what your friends are listening to. For $10, you can do all that and store the music to your phone for offline or higher quality enjoyment.