John Milton Cage Jr. (September 5, 1912 - August 12, 1992) was an American composer. A pioneer of chance music, electronic music and non-standard use of musical instruments, Cage was one of the leading figures of the post-war avant-garde and, in the opinion of many, the most influential American composer of the 20th century. He was also instrumental in the development of modern dance, mostly through his association with choreographer Merce Cunningham, who was also Cage's romantic partner for the most part of the latter's life.

Cage is perhaps best known for his 1952 composition 4′33″, the three movements of which are performed without a single note being played. A performance of 4′33″ can be perceived as including the sounds of the environment that the listeners hear while it is performed, rather than merely as four minutes and thirty three seconds of silence and has become one of the most controversial compositions of the century. Another famous creation of Cage's is the prepared piano (a piano with its sound altered by placing various objects in the strings), for which he wrote numerous dance-related works and a few concert pieces, the most well-known of which is Sonatas and Interludes (1946-48).

His teachers included Henry Cowell (1933) and Arnold Schoenberg (1933-35), both known for their radical innovations in music, but Cage's major influences lay in various Eastern cultures. Through his studies of Indian philosophy and Zen Buddhism in the late 1940s, Cage came to the idea of chance-controlled music, which he started composing in 1951. The I Ching, an ancient Chinese classic text on chance events, became Cage's standard composition tool for the rest of his life. In a 1957 lecture, Experimental Music, he described music as "a purposeless play" which is "an affirmation of life - not an attempt to bring order out of chaos nor to suggest improvements in creation, but simply a way of waking up to the very life we're living".

In addition to his composing, Cage was also a philosopher, writer, artist, printmaker and an avid amateur mycologist and mushroom collector.

John Milton Cage (September 5, 1912 – August 12, 1992) was an American experimental music composer, writer and visual artist. He is most commonly known for his 1952 composition 4’33”, whose three movements are performed without playing a single note. Cage was an early composer of what he called “chance music” (and what others have labeled aleatoric music) — music where some elements in the music are left to be decided by chance; he is also well known for his non-standard use of music