music, video, and pretty much all "timeless" works of art can potential benefit. I would envision at some point that ongoing revenues could also be redirected back to the original creator as well for including songs, images, etc as a small usage royalty. There are already at least a few initiatives working on such models. The main difference here is that on STEEM, there hasn't really been a "clearer way" to do that without the need to directly "charge" people for it.