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	Art History 1936: Dali: Premonition of Civil War   1952: Pollock: Yellow Islands   1963: Lichtenstein: Whaam!   1971: Hockney: Mr and Mrs Clarke