This is so cool!

A 639 year-long concert?
http://www.npr.org/templates/story/story.php?storyId=92502862
More on "As Slow As Possible"
http://www.npr.org/programs/pt/features/2003/sep/aslsp.html
PBS American Masters:
http://www.pbs.org/wnet/americanmasters/database/cage_j.html