4′33″

Wikipedia - "4′33″ (pronounced Four minutes, thirty-three seconds or, as the composer himself referred to it, Four, thirty-three) is a three-movement composition by American avant-garde composer John Cage (1912–1992). It was composed in 1952 for any instrument (or combination of instruments), and the score instructs the performer not to play the instrument during the entire duration of the piece throughout the three movements (the first being thirty seconds, the second being two minutes and twenty-three seconds, and the third being one minute and forty seconds). Although commonly perceived as 'four minutes thirty-three seconds of silence', the piece actually consists of the sounds of the environment that the listeners hear while it is performed. Over the years, 4′33″ became Cage's most famous and most controversial composition."
Wikipedia, Solomons Music, Classical Notes, John Cage, «4'33''», 1952, YouTube, (1) - David Tudor, (2)