John Milton Cage Jr. (September 5, 1912 – August 12, 1992) was an American composer, philosopher, poet, music theorist, artist, printmaker, and amateur mycologist and mushroom collector. 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. Critics have lauded him as one of the most influential American composers of the 20th century. He was also instrumental in the development of modern dance