piano roll

a roll of paper containing perforations such that air passing through them actuates the keys of a player piano.


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World English Dictionary
piano roll
Also called: music roll a perforated roll of paper actuating the playing mechanism of a Pianola

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
These pedal actions were marked on the piano roll with special punches.
In fact, the hottest technology for getting music into the home was the piano roll.
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