4'33" has subsequently built up a rich interpretive tradition amongst musicians. I once heard a performance on the radio, as an encore to a piano recital in which, judging from the noises off and audience laughter the performer took it as an opportunity to leap off stage and run around the auditorium, timing his arrival back on stage with the end of the piece. (I may of course have been entirely misguided about this since radio is hardly a visual medium). In another performance (again on the radio) the silence was filled with a veritable cacophony coming form the orchestra (presumably off stage) - sounding like the Tom and Jerry cartoon where they have a fight in an orchestra.