This MIDI controlled music visualization application presents piano music as abstract geometric art.
Since not only the notes played but also the interpretation of the piano player are influencing the outcome, visualizations for one single piece of music will vary, too. Therefore the stripes allow one to say something about the composition aswell as the specific performance: Which notes were played the most? Which were the loudest notes? Which range of the keys was played mostly? How harmonically constant was the music?
Gorgeous. I'd think the player benefits just as much as the audience.