I'm actually kind of excited about the really random "The Music of DC Comics" CD that they're putting out.
A lot of those are songs I've heard; but a lot of them I haven't. And regardless, most of them are tunes I've wanted to listen to at one point or another. But you can't really do that when you only have them in videos.
I'm one of those people who likes to have background music for a lot of things. Reading my comics is one of them. Usually I have to just select music from my collection that I think feels appropriate at any given time. But soon enough my music will really fit.