This may be old stuff to some but you've got to check out this site...
www.pandora.com
It allows you to set various "music radio stations" by typing in a favorite player, singer, group, etc. In addition to playing the favorite's music it chooses other artists who are similar...a great way to become exposed to new music you may not have otherwise known. If you don't like the selection picked, you just click the "thumbs-down" icon and it goes on to another.
I have about 5 stations that I listen to depending on my mood. It's also possible to randomly select music from your stations. I've been listening for a week now and am amazed. It's all free and fantastic!
Let me know what you think.