Ever listened to a musical piece for 639 years ;-)

In Halberstadt in Germany a piece of John Cage is performed at the moment. The piece is called ORGAN2/ASLSP (as slow as possible). The duration of the overall performance will be 639 years! Very interesting idea, so generations can talk over the piece and talk to each other. We (our generation could today listen to the 6th change in sound in the masterpiece. Unfortunately I will not be able to be there. Probably for the 7th change. 😉