The piano is a one of the most popular instruments in the world. Widely used in classical music for solo performances, ensemble use, chamber music and accompaniment, the piano is also very popular as an aid to composing and rehearsal. Although not portable and often expensive, the piano's versatility and ubiquity have made it one of the world's most familiar musical instruments.
It produces it's sound by pressing on the key board and making the felt-covered hammer to strike steel strings. The hammers rebound, so that to allow the strings to continue vibrating at their resonant frequency.These vibrations are then transmitted through a bridge to a sounding board that more efficiently couples the acoustic energy to the air. The sound would otherwise be no louder than the sound that is directly produced by the strings. When the key is released, a damper will stop the string's vibration.
Grand Piano
Copied from: http://en.wikipedia.org/wiki/Piano
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