I switched from Spotify to Rdio recently. As someone that likes to hack on music projects, I'm really impressed with the Rdio API. I especially like their integ

I switched from Spotify to Rdio recently. As someone that likes to hack on music projects, I'm really impressed with the Rdio API. I especially like their integration with Echonest, which gives you a deep "beat-by-beat" analysis of every track on Rdio.