I've recently become interested in the concept and creation of audio visualization. When we listen to music, it can stir emotions or memories that translate into images. In its most basic form, this resembles Windows Media Player and its various moving images to accompany your music. The video below is much like that. Points of inflection are shown by brigter lights or a larger image, while softer moments have softer images.
However, I think the concept can be expanded upon to produce something that resembles a hybrid of what's below and a more traditional music video.