Pandora ... music by the masses
Ok ... this is a cool web site: Pandora
I know that it might be old, but I just found it and it's pretty cool. You enter a artist or song and it begins to stream music to you that they feel fits that "sound". The best part is that you can then vote if you feel that a song applies or not ... so that your feedback continues to mold the genre of music.
I'm listening now for a bit. It would be cool if they did a "custom podcast" that I could download.