I haven’t linked from here to the Music Animation Machine, for some reason, mostly not thinking of it sooner.
I must have found it by searching for Claire de Lune, and finding links to a piece of music by that name by Debussy, one of which was a YouTube clip of a video generated by the Music Animation Machine. It looks like a color version of a player piano roll, but that’s just one of eight or a dozen different kinds of animation it can produce. Some time when you have time to get lost in a web site, give that a look.