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The hole in the body of guitar-and any other similar stringed instrument-provides an escape route for sound waves. A guitar has a wooden body to serve as an amplifier and to give the instrument its characteristic timbre. If the sound waves were unable to escape, a guitar would be barely audible because the strings when they are plucked or strummed produce only very small vibrations. It is only when the vibrations are transferred to the wooden body and the air inside the body-and then released through the sound hole-that they are amplified enough to be clearly audible to an audience.
Electric guitars don't need either a hole or a sound box. Instead. an electric 'pick-up' catches the vibrations of the strings and feeds them into an amplifier, which forms part of the instrument.
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