MyRiff.  It's pretty simple.
It's Riff for a Pandora and Spotify world.

Each MyRiff channel gives you a starting point.  You take it from there.

Customize the playlist, get rid of songs you can't stand, rate the ones you like  and share the channel with your friends.

And when you listen, you're not alone.  You'll still hear from the Riff jocks, keeping you in touch with everything  in the D, but with myRiff, you have the musical controls.