Free streaming music from You Tube, but w/o the video...from Songza!

I want my MTV Songza! Don't know how they do it or where they pull the music from (some say a bit of it comes from the music-only part of music videos found on you tube) but they got it right for me. My favorite blog, Uncov, reviewed this a week back and loved it as well . Songza is free, and you can create playlists of your favorite songs and share those with friends. Not sure how they monetize this but hey its free and very responsive/quick in loading up what songs you want to hear. Try it out -its worth a look.