Definitions for piano roll
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Random House Webster's College Dictionary
pian′o roll`(n.)
a roll of paper containing perforations such that air passing through them actuates the keys of a player piano.
Category: Music and Dance
Origin of piano roll:
1925–30
Wiktionary
piano roll(Noun)
A perforated roll of paper containing encoded music to be played by a pianola or player piano.
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