A shallow drum made of a circle of wood with calfskin stretched across one side, the tambourine also has small jingles or metal discs set in the circle of wood. The tambourine produces sound when it is shaken, rubbed, or struck on the head with the knuckles. Early tambourines were played by Turkish army musicians known as "Janissaries," and Mozart first used the tambourine in his orchestra in 1782.