I was sad when I had to switch to Spotify. Rdio was clean. Even today I don't understand Spotify. Rdio also had an amazing recommendation engine from Echo Nest

I was sad when I had to switch to Spotify. Rdio was clean. Even today I don't understand Spotify. Rdio also had an amazing recommendation engine from Echo Nest. Even though that company got bought by Spotify it took them a long time after the acquisition before they had decent recommendations.