The banjo is a four-, five-, or six-stringed instrument with a thin membrane stretched over a frame or cavity as a resonator, called the head, which is typically circular. The membrane is typically made of plastic, although animal skin is still occasionally used. Early forms of the instrument were fashioned by Africans in the United States, adapted from African instruments of similar design. The banjo is frequently associated with folk, Irish traditional, and country music. Banjo can also be used in some Rock Songs. Countless Rock bands, such as The Eagles, Led Zeppelin, and The Allman Brothers, have used the five-string banjo in some of their songs. Historically, the banjo occupied a central place in African-American traditional music and the folk culture of rural whites before entering the mainstream via the minstrel showsof the 19th century. The banjo, along with the fiddle, is a mainstay of American old-time music. It is also very frequently used in traditional jazz.