From Wiki:
Conceived around 1947–1948, while the composer was working on Sonatas and Interludes,[2] 4′33″ became for Cage the epitome of his idea that any sounds constitute, or may constitute, music.[7] It was also a reflection of the influence of Zen Buddhism, which Cage studied since the late forties. In a 1982 interview, and on numerous other occasions,
Cage stated that 4′33″ was, in his opinion, his most important work.[8]
The musicians 'playing' this make out like bandits on a per note basis.
