Ghatam is a large earthenware pot with a mouth of about four to five inches diameter. There is no membranous covering for the mouth. It is very widely used in South Indian classical Carnatic music performances. This instrument is played squatting on the floor. There are two actions of resonance. The primary one is the ringing of the pot caused by striking the body with fingers. A very low resonance produced by the cavity. This pitch is raised or lowered by opening or closing the mouth with the stomach of the player.