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piano roll

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piano roll

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

Origin:
1925–30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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piano roll  
n.  A roll of paper containing perforations corresponding to the notes of a musical composition, used in operating a player piano.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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