You've probably heard of John Cage because of the recent campaign to get his composition 4'33" to the top of the charts and forestall the latest Simon Cowell monstrosity from being number one at Xmas. I have no idea how that campaign went, nor do I care who is number one on the charts or whether Simon Cowell lives or dies. But we need more people like John Cage.
Another of Cage's projects is the ORGAN2/ASLSP As Slow aS Possible taking place at the church of St. Burchardi in Halberstadt. An organ is being gradually constructed and occasionally changing notes - the project is not scheduled to finish for 639 years and 2010 was notable because in July the note changed. (See also The John Cage Trust Blog.)
Let's hope nobody decides to have another war and drops a bomb on Halberstadt meanwhile.