Piano is very popular instrument in the world. Piano is musical instrument and also know as a keyboard. 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.
but piano is more expensive and not portable. Beacuse of its versatility and ubiquity piano is most familiar musical instrument in the world.
Pressing a key on the piano's keyboard causes a felt-covered hammer to strike steel strings. The hammers rebound, allowing the strings to continue vibrating at their resonant frequency. These vibrations are transmitted through a bridge to a sounding board that couples the acoustic energy to the air so that it can be heard as sound. When the key is released, a damper stops the string's vibration. See the article on Piano key frequencies for a picture of the piano keyboard and the location of middle-C. Pianos are string instruments. According to the Hornbostel-Sachs method of music classification, they are grouped with chordophones.
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