John Cage At 100

" John Cage's most famous, or infamous, work is 4'33", in which a musician walks on stage and sits at the piano for 4 minutes and 33 seconds.The "music" in this seemingly silent composition is all of the sound that occurs in the concert hall — the coughs, the rustling, the noise coming in from outside. In a 1963 interview with public radio station KPFK, Cage described a revelation he'd had 15 years earlier, when he visited an anechoic chamber at Harvard University: a room that's supposed to be completely silent. "In that room, I heard two sounds, whereas I expected to hear nothing," Cage said.
 "So when I got out of the room, I asked the engineer what those two sounds were.
 One was high and one was low. And he said, 'Well, the high one was your nervous system in operation. And the low one was the circulation of your blood.' Therefore, even if I remain silent, I was, under certain circumstances, musical.""
Music Is Everywhere: John Cage At 100 : NPR /more