The jug sound is made by taking a jug (usually made of glass or stoneware) and buzzing the lips into its mouth from about an inch away. As with brass instruments, changes in pitch are controlled by altering lip tension, and an accomplished jug player could have a two-octave range. The stovepipe (usually a section of tin pipe, three of four inches in diameter) is played in much the same manner, with the pipe rather than the jug serving as the resonating chamber. There is some similarity to the didgeridoo, but there is no contact between the stovepipe and the player's lips. Some jug and stovepipe players utilize throat vocalization along with lip buzzing, as with the didgeridoo.