Another of Cage's works, Organ² / ASLSP, is currently being performed near the German township of Halberstadt; in an imaginative and controversial interpretation of Cage's directions for the piece to be played "As SLow aS Possible", the performance, being done on a specially-constructed autonomous organ built into the old church of St. Burchardi, is scheduled to take a total of 639 years after having been started at midnight on September 5, 2001.
So yeah, cool. I really liked "Music For Amplified Toy Pianos," as well as what I've heard from Sonatas and Interludes so far.