Sound is produced by vibrating objects. Voicebox or larynx is a part of the throat which produces sound in humans. It has two vocal cords which are stretched across the larynx that it leaves a narrow slit between them for the air. When the lungs force the air through the slit, the vocal cord vibrates and produce sound.
(1) Drums – Its stretched membrane
(2) Sitar – Its strings.
(3) Flute – Its long hollow pipe.