This is surely the definitive version, by the pianist who premiered the piece. I have written about this piece before, but it just keeps popping up. Like so much else from Cage it has an aura of mystic profundity at the heart of which is really just emptiness. Is it the profound emptiness of Tao? Or just vacuity? I once got into a three-day argument over the ontological status of the piece with a very learned philosopher. We finally declared an armistice by agreeing that this was not a piece of music as such, but a piece of 'meta-music', a piece, that is about music without actually being music. Perhaps the strongest argument for the piece is that it is absolutely original. Well, except that Erwin Schulhoff composed a piece exactly the same in 1919. Here is the third movement from Fünf Pittoresken:
Which consists entirely of rests. Cage's piece is a 'development' of this as he expands the concept to three movements. What do you think? A viable piece of music? Merely a dead end? An interesting concept?