Disrupt.fm is based on the premise that pirating music is a common occurrence -- one that yields no benefit for musicians when it comes to publicity. To solve that quandary, Glassanos has come up with an alternative method of free music sharing.
Basically, artists can upload their music to Disrupt.fm, which users can then download for free. However, that song doesn't just end up in the black void of a user's iTunes library -- since one is prompted to connect to Disrupt.fm via Facebook, the song is also automatically shared to the user's Facebook wall, where it can be listened to as a stream by friends.
Currently, the selection on Disrupt.fm is not — shall we say — the best, and the UI is a little clunky (you can't search for artists, etc), but the idea is solid. Ideally, an artist would upload a few tracks to the service -- to prevent a fan from snagging the entire album for free -- and gain buzz for a new album thusly.
While this service is reminiscent of pre-existing clients like Track For a Tweet, it kicks it up a notch by catering to Facebook users, who are much more plentiful than those using Twitter.