I love Pandora!
The basic idea is that you pick out a song or group and it will play songs that are similar in genre, you hear alot of music that you would never hear on regular radio. You basicaly make your own station by giving a "thumbs up" or a "thumbs down" to the songs that get played. You can make up to 100 music stations and can edit, add music or even email a station to a friend.
It's free, just need to register.
I learned about Pandora on another forum couple months ago and I've listened to it at my work station ever since. I typed in the group Asia and it played some Poco Harum, UK, King Crimson, Uriah Heap and Yes. I was astonished, it depends on what you give a thumbs up to I guess.
Try it, you may enjoy it, no microphonies at all.
http://www.pandora.com