Cody and Chelsea told me about Pandora Radio and I just had to share it because it's AWESOME! You can just type in your favorite song or artist and it cooks up a station especially to match those types of artists and songs that you like. Then, if you want to add some variety you can continue to add artists and songs that you like AND let them know which songs you like and dislike to make it just perfectly to your liking.
I am REALLY enjoying this. It's like they are in my head and know just what I want to hear. Crazy! I don't know the logistics of it all, but I love it! Listening to it on my computer and my iTouch is delightful and it gives me some exposure to songs I may want to buy. Oh, and it's free!
Here is the website and here is the Pandora application to download to your iPhone or iTouch.