A piano roll is a music storage medium used to operate a player piano, piano player or reproducing piano. Piano rolls, like other music rolls, are continuous rolls of paper with holes punched into them. These perforations represent note control data. The roll moves over a reading system known as a tracker bar; the playing cycle for each musical note is triggered when a perforation crosses the bar.

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.