I wrote about Scroll-o-Meter, an unusual Chrome extension that keeps track of how far your finger travels each day, a couple of weeks back. Now here’s an even more brain frazzling experiment from the same team: Jazz.computer.
You actions affect the instruments, effects, tempo, chords and which sections of the song play. At the top of the page the song plays at 130 bpm, at the bottom its a more funereal 65 bpm. The arrangement changes with the tempo.
If you want to mess with the song even more, you can fiddle around under the hood here with controls for the visuals, effects and instruments.
Warning: Once you get started you may be there for some time. This one is a serious productivity killer.