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Class of 2023: Jack Allen shares passion for music—and compassion for others—through the piano | Vanderbilt University
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A detail of the mechanic of an old upright piano, with the levers (fly, jack, underhammer and shank) to move the string hammers Stock Photo - Alamy
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Piano Regulation - Adjusting The Jack Position On A Grand Piano Action I HOWARD PIANO INDUSTRIES - YouTube
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7 Illustration of the function of the piano action at successive stages... | Download Scientific Diagram
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