That's the thing I loved most about Spotify. Unfortunately their "radio" sucks. It generates a 1 time playlist of 50 songs. Pandora has the shittiest interfaces ever, but it does a damn good job DJing for me. Most of the time, I just want to turn it on, pick a genre and let it go. I don't want to listen to the same 50 songs over and over in the same order.