Just listened to John Cage's musical piece
as linked to from https://infogalactic.com/info/4%E2%80%B233%E2%80%B3
Well, I only listened a little bit. It was very predictable. However, it was just as funny as Israeli Prime Minister Benjamin Nentanyahu's silent, glary, UN stare-down speech.
So anyway, the question is: Why 33?