Yesterday, the second chord change of the longest concert EVER occurred.
UPDATE 2016-06-14: I changed the broken link that was previously in this post to a more recent one that works and has a bit more history about ASLSP. Shout out to Dmitry at Artsy who found this post recently and informed me about Arty’s John Cage page. Check it out if you’re interested in learning more about Cage and his music.