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Piano is abbreviated p in sheet music. Image Â© Brandy Kraemer. Definition: Piano, most often seen as p, affects the dynamics (or volume) of a musical composition. Piano is an indication to play softly; louder than pianissimo, but softer than mezzo piano. See forte.
Here's a typical action for an upright piano, devised by inventor Isaac Bullard of Hyde Park, Massachusetts in the late 19th century. It's an example of what's called a French-repeating action, because it allows notes to be played rapidly in quick succession. 1  Key (gray). 2  Key pivots about center point (blue).