John Cage's Dance to the Music of Time.

I’ve always found John Cage’s music project in a church in the town of Halberstadt in Northern Germany totally beguiling.

Cage (now deceased) initiated, what is proposed to be the longest and slowest musical recital in history in 2000. Its set to last 639 years!.

Apparently it was 639 years before 2000 (1361) when Halberstadt produced the first 'block single organ'. It has a keyboard arrangement that leads us to the modern piano, and all the greatest musical compositions that go with that.
Its the instrumental Daddy of western music.

Cage has paid homage to it by composing what appears to be (in normal time frames) a very slow, eerie, monotone organ music - there is about one chord change per year. But what the composition is really reflecting back to us is our human perception of time.

I think its a lovely idea: the births, lives and deaths of generations shall continue cyclically, and in this Church in Halberstadt, the organ will continue to play out its long lament, generations after you and I are merely eddies of dust spinning in the breeze.

http://en.wikipedia.org/wiki/As_Slow_As_Possible