Wikipedia
HPSCHD
HPSCHD (pronounced as acronym: eɪtʃ-piː-ɛs-siː-eɪtʃ-di:, although Cage himself said the title is "Harpsichord"), is a composition for harpsichord and computer-generated sounds by American avant-garde composers John Cage (1912–1992) and Lejaren Hiller (1924–1994). It was written between 1967 and 1969 and was premiered on May 16, 1969, at the University of Illinois at Urbana–Champaign.