piano roll

n. A roll of paper containing perforations corresponding to the notes of a musical composition, used in operating a player piano.

n (Music, other) a perforated roll of paper actuating the playing mechanism of a Pianola. Also called: music roll

pian′o roll`

n. a roll of paper containing perforations such that air passing through them actuates the keys of a player piano. [1925–30]

The perforated roll of paper that controlled the hammers of a Player piano.

单词	piano roll
释义	piano roll piano roll n. A roll of paper containing perforations corresponding to the notes of a musical composition, used in operating a player piano. piano roll n (Music, other) a perforated roll of paper actuating the playing mechanism of a Pianola. Also called: music roll pian′o roll` n. a roll of paper containing perforations such that air passing through them actuates the keys of a player piano. [1925–30] Piano roll The perforated roll of paper that controlled the hammers of a Player piano.
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