I agree that the zzz is somewhat confusing, but I'm having a hard time coming up with an icon that expresses the idea that you are tired of a song. (Pandora hides this feature one menu deep in its UI.)

It seems like the kind of feature that doesn't belong buried in a menu on a tough screen interface, for use say when you are driving.

Really what the feature is, is a temp-ban. But I can't really think of an icon for that either.... hmmm...

ideas?