Not sure if anyone here uses Spotify, but if you don't, you should definitely check it out. They've recently updated the app to now include artist radio. I'm listening to a mix of music that they consider to be similar to Texas Blues Artist Jimmie Vaughan. And it's pretty good stuff. 

More info in this article: 

http://www.billboard.biz/bbbiz/industry/digital-and-mobile/spotify-...

And if you want to learn more about Spotify, check this out: 

http://www.spotify.com/us/about/what/

I highly recommend it. I have playlists that I can share with anyone out there when you get setup. It's all free.

Michael