One is inclined to agree with you, but who in tarnation even IS John Cage?
He was a "classical" composer in the last century who "composed" works such as "4'33," a "composition" that is four minutes and 33 seconds long and consists of three movements, all of which are tacet, or silent, with no instruments playing or vocalists singing. Believe it or not, some orchestras actually perform this "composition.".
Another of his "compositions" calls for one note playing every two or three months, and the performance continues for abut 600 years before it concludes.
The eighteenth and nineteenth centuries can keep their Bachs, Mozarts and Beethovens. We have John Cage!