Piano roll. A stack of piano rolls, some in boxes, some not.
First part of a piano roll for Welte-Mignon with lines for a pianolist A piano roll is a music storage medium used to operate a player piano, piano player or reproducing piano. A piano roll is a continuous roll of paper with perforations (holes) punched into it. The perforations represent note control data. The roll moves over a reading system known as a 'tracker bar' and the playing cycle for each musical note is triggered when a perforation crosses the bar and is read.
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