4′33″ - Wikipedia
https://en.wikipedia.org/wiki/4%E2%80%B233%E2%80%B3
Silence played a major role in several of Cage's works composed before 4′33″. The Duet for Two Flutes (1934), composed when Cage was 22, opens with silence, and silence was an important structural element in some of the Sonatas and Interludes (1946–48), Music of Changes (1951) and Two Pastorales (1951). The Concerto for prepared piano and orchestra (1951) closes with an extended silence, and Waiting (1952), a piano piece composed just a few months before 4′33″, …
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