Compositions   1951: Concerto for Prepared Piano 1952: 4' 33" 1958: Piano Concerto 1960: Cartridge Music 1969: HPSCHD 1972: Bird Cage 1981: Thirty Pieces for Five Orchestras	Philosophy 1943: Sartre: Being and Nothingness     1956: Dewey: Reconstruction in Philosophy   1970: Ayer: Metaphysics and Common Sense