Another alternative to Spotify. Direct link here too ->http://beta.mflow.com
This is in beta mode and works differently, but here is how it does in their own words, below..
We believe that...
music is for listening
We believe that you should be able to listen to music without paying monthly subscription fees, and without having to put up with annoying adverts. After all, if you're going to buy music, you're going to need to listen to it in full first.
music is better shared
We believe that the best way to find new music is through other people, and that it should be easy to legally share music with your friends - be they on mflow, facebook, twitter or buzz. More people buy music through a friend's recommendation on mflow than in any other way.
music should be rewarding
We believe that when you buy music, the person that recommended it to you should be rewarded. By buying DRM-free music on mflow, you're not only making sure the artists get paid, you're also giving a big thank you (20% of the price, to be exact) to the person that recommended it to you.