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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.
A player piano is a self-playing piano, containing a pneumatic or electro-mechanical mechanism that operates the piano action via pre-programmed music recorded on perforated paper, or in rare instances, metallic rolls, with more modern implementations using MIDI. The rise of the player piano grew with the rise of the mass-produced piano for the home in the late 19th and early 20th century. Sales peaked in 1924, then declined as the improvement in phonograph recordings due to electrical recording