“Banjo, stringed musical instrument of African origin, popularized in the United States by slaves in the 19th century, then exported to Europe. Several African stringed instruments have similar names—e.g., bania, banju. The banjo has a tambourine-like body with a hoop and a screw that secure the vellum belly to the frame. Screw stretchers are used to vary the tension of the belly. The strings pass over a violin-type, or pressure, bridge and are hitched to a tailpiece. In the 1890s, frets were added to the long neck, and a machine head with screws replaced the tuning pegs.
Variants of the standard banjo abound. Banjos played with a plectrum, or pick, rather than fingers lack the chanterelle. On a zither banjo the vellum is suspended in a resonator that throws the sound forward; the chanterelle, tuned from the head, passes under the fingerboard to emerge at the fifth fret. The banjo is widely played in U.S. folk music and has also been used in jazz ensembles.”