How does the piano create sound?
When you push down a key, the mechanism inside (the action) makes a hammer go up (in a grand) or forward (in an upright) to strike the strings. The hammer is a round stick with a head on it (it looks something like a real hammer), and the head is covered with very dense wool felt. When the string vibrates it makes a musical sound; the string is connected to a large soundboard that amplifies the sound much louder than the string could do by itself. When you let go of the key, a felt pad, called a damper, drops back onto the string and stops the sound again. When you press down the right pedal with your foot it raises all the dampers so that the strings can keep sounding.
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