I absolutely love Pandora.com!
Pandora is a radio station(?) that you program with all your favorite genres of music. This is what I really like about it, you type in a certain artist or song and it will pull up suggestions and you can pick which song you want to listen to and then it will suggest other songs or artists that are similar in style. At this point you can use a thumbs up or a thumbs down if you like or don't like the song and it will go on to suggest other songs.
So what it essentially does, is to create a personal station for you. After that, if you want to listen to an entirely different style or artist, you start a whole new station. You can have as many stations you like.
I have found so many new artists and songs I never knew existed. It has opened a whole new world for this little house potato.
So go to www.pandora.com and start your own radio station (without commercials and DJ). Have fun!