"John Cage's instructions are "no sound is intentionally made" (my italics) so in a live performance of 4:33 any squeaking chairs, coughing, sniffing and breathing noises made by a live audience are deemed part of the musical experience."

I heard that one of the most interesting recorded permanences by Cage - and enjoyed by him - was when a couple of back stage workers in the wings talked the whole way thru about what a wanker Cage was....

:-)