I downloaded and "joined" Rhapsody recently. They have a function called Radio station, it allows you to program your favorite artists of any genre and hear endless music of theirs and artists like them. I entered Oscar Petersen, Ahmad Jamal, McCoy Tyner and Harry Connick Jr. and I am in heaven. Two days later I'm a fan of new artists, more a fan of my old artists and the music is still going strong. Just thought I'd share.
I recently downloaded iTunes as my media player for my work PC and they also have a streaming music feature called 'Radio'. I really like the di.fm Vocal Trance channel...really cool club music to keep me awake at work. I'm generally not an Apple fan, but the iTunes program is a pretty cool app. Can convert and burn a wide range of music types...and it was free!