UPDATE: I've got more invites now, if anyon wants one!
In reading my many RSS feeds (view my shared items or subscribe to them), I came across the web site Fairtilizer – which is a mix between MySpace Music and Digg. You can upload and share songs, plus vote on your favorites. Then, you can listen to what people have voted on the most, post comments and even create your own playlists... like this one, below. Check it out and go sign up for the beta. If I had more invites, I'd offer them out.