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If a piano hammer were attached directly to the back end of a key, when the key was depressed, the hammer would hit the string and stay there, damping out all vibration and sound. For this reason, all piano actions have some kind of escapement mechanism for each key, allowing the hammer to be released from the key just before hitting the string. When the key is released, the action returns to its original position and resets itself for another cycle. - Piano Sheet Music