What composer wrote 4′33″ (pronounced "Four minutes, thirty-three seconds" or just "Four thirty-three")?

John Milton Cage Jr. (September 5, 1912 – August 12, 1992) was an American composer, music theorist, writer, philosopher, and artist. He was considered the biggest influence in experimental music. His composition 4'33" is a three movement composition. Composed in 1952, for any instrument or combination of instruments, and the score instructs the performer(s) not to play their instrument(s) during the entire duration of the piece throughout the three movements.. What makes the piece unique is that in that time the audience is supposed to listen for all the sounds in the venue. A cough from the balcony. The whispers of people that don't understand. One music critic once commented to Cage that he could have written that piece, to which Cage replied, "But you didn't. I did."

His music included outside noises and concerts with windows open for the external sound. His philosophy was that "an experimental action is one the outcome of which is not foreseen", and he was specifically interested in completed works that performed an unpredictable action.