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From fingertip to soundboard: inside one piano note

Portrait cutaway editorial illustration of a grand piano showing one fingertip pressing a key and a clear mechanical path through the key, action, hammer, string, bridge, and soundboard into radiating sound waves.
A single keystroke travels through the piano’s action: the key lifts the hammer, the hammer strikes a tensioned string, and the vibrating string transfers energy to the soundboard, which moves the surrounding air. Details are simplified for clarity and vary among piano designs.
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