Pandora Radio

Have any of you used Pandora Radio? Someone just told me about it, and I found it interesting. If you enter an artist or song, it picks songs it thinks are similar based on musical "genes" - or what the song sounds like (melody, rhythm, etc). At first I was wondering if the computer somehow analyzed the songs to compare them. But it sounds like they actually have people who analyze the qualities of all the songs. I think they must also use data people enter, because you can choose whether you like the song or not.

I don't know if this has any relevance for us, but I thought it was an interesting technology!