Piano is an acoustic instrument. Invented by Bartolomeo Cristofori in 1700 (exact year unknown) in which wires are hammered. The instrument is played by a keyboard (keyboard) in which the musician presses both keys with his fingers or sixty fingers so that the hammers hit the strings and a melody is played. The word piano stands for the Italian word forte piano. Early piano models were known by this name in 1700. The word piano means soft and the word forte means long. The amount of sound produced by this instrument depends on the amount of pianist finger pressure on the key: the higher the pressure on the key, the higher the hammer pressure and the sound of the production song. Will be higher. The first forte pianos in the 1700s had a quieter sound and a smaller dynamic range. The acoustic piano usually has a wooden protector around the keyboard and metal strings. Pressing one or more keys on the keyboard causes the hammer to hit the wires. The hammer returns to its original position after hitting the wire. And the wires continue to vibrate at their resonant frequency. These vibrations are transmitted across the bridge to the soundboard, which amplifies the acoustic energy. When the switch is released, the damper stops the vibration of the wires and ends the sound or so-called muffle. Even by removing the fingers from the key, the notes can be held up using the pedal.