http://www.youtube.com/watch?v=xUHQ2ybTejU&eurl=http%3A%2F%2Fwww%2Eboingboing%2Enet%2F&feature=player_embedded#t=176 This video of Canon 1 à 2 from J. S. Bach's Musical Offering (1747) being turned into a Moebius strip, then played in two directions at the same time