I'm going to play devils advocate here for a moment...

Doesn't it kinda' make sense that the best performers rise to the top, and the music consumer wants them to perform the best songs? I think the problem is a composition is physical, it's tactile and easy to own, but a performance isn't. However, without the right performance the composition goes nowhere. If the performance is what's selling the composition, then isn't it only fair that the performer own a piece of that?

Just as there are a thousand lyricists for every musician, aren't there a thousand musicians for every great performer?