Samuel Conlon Nancarrow was an American-Mexican composer who lived and worked in Mexico for most of his life. Nancarrow is best remembered for his Studies for Player Piano, being one of the first composers to use auto-playing musical instruments, realizing their potential to play far beyond human performance ability. He lived most of his life in relative isolation and did not become widely known until the 1980s.

György Sándor Ligeti was a Hungarian-Austrian composer of contemporary classical music. He has been described as "one of the most important avant-garde composers in the latter half of the twentieth century" and "one of the most innovative and influential among progressive figures of his time".