Question: HPSCHD is a composition by which music theorist and writer?
Sentence (from "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).
Relevant evidence: Yes