what produces a musical sound
An instrument creates sound when part of it vibrates rapidly. The column of air inside a wind instrument, the string of a string instrument, or the stretched skin of a drum all vibrate when played. This vibration produces sound waves in the air, which we hear as musical notes. When a musician hits a key, a hammer strikes a string inside the piano. The string vibrates, making a sound. In a grand piano the strings are arranged horizontally.