Music Realized as Colored Bars: Music Animation Machine
Old, but worth mentioning [....] The Music Animation Machine renders familiar music as series of colored bars, in still image or animated video, reminiscent of a piano roll editor in a sequencing application. Color represents harmonic area, so as you look at the piece you see form, structure, shape, and harmony in new ways. It certainly raises some interesting questions: with new tools at our disposal, what might be a more useful (or visually exciting) way of looking at music? With interactive tools, you could even play with the resulting renderings in real-time. [....]

Pictured: Bach Brandenberg No. 6, mvmt. 3.