“In the abandoned Burchardi church in the German town of Halberstadt, the world’s longest concert moved two notes closer to its end Monday: Three years down, 636 to go. The addition of an E and E-sharp complement the G-sharp, B and G-sharp that have been playing since February 2003 in composer John Cage’s ‘Organ2/ASLSP’ — or ‘Organ squared/As slow as possible’.”