The banjo is a stringed instrument of African American origin, early or original examples sometimes being called the "gourd banjo". One very compelling African banjo predecessor is called the "Akonting." It is a spike folk lute played by the Jola tribe of Senegambia. The name "banjo" is commonly thought to be derived from the Kimbundu term mbanza. Some etymologists derive it from a dialectal pronunciation of "bandore", though recent research suggests that it may come from a Senegambian term for the bamboo stick used for the instrument's neck.
The modern banjo comes in a variety of different forms, including four- (plectrum and tenor banjos) and five-string versions. A six-string version, tuned and played similar to a guitar is gaining popularity. In almost all of its forms the banjo's playing is characterised by a fast strumming or arpeggiated right hand, although there are many different playing styles.
The banjo consists of a wooden or metal rim with a plastic polyester ( PET film) or calf or goat skin drumhead stretched across it, a neck mounted on the side of the rim, a tailpiece mounted opposite the neck, four or five strings, and a bridge. The woods used in construction vary, but are often combinations of maple, walnut, and ebony for fingerboards, pegheads, and the tops of bridges. In the five-string banjo, the fifth peg is normally on the side of the neck, although some English versions (the Zither banjo) mount the fifth string tuner on the tuning head with the others, and route the string through a tube in the neck where it exits near the fifth fret.
The earliest banjos were unfretted, like the African and Asian instruments that inspired them, but most banjos today are fretted. Banjo strings are most commonly metal, although nylon and gut can be used on some banjos, especially those played in the classical style. The two most common modern day acoustic banjos are the resonator banjo which has a detachable chamber, or resonator, on the back of the rim and the open back banjo which does not have a resonator. There are also solid body electric banjos; one such banjo, the Crossfire (manufactured by Deering), has two powerful magnetic pickups under the drumhead. A metal footed bridge ensures that pickups draw sound from both the strings and the head.
The banjo can be played in several styles and is used in various forms of music. American Old-time music typically uses the five-string open back banjo. It is played in a number of different styles, the most common of which are called clawhammer (or "claw-hammer") and frailing, characterised by the use of a downward rather than upward motion when striking the strings with the fingers. Frailing techniques use the thumb to catch the fifth string for a drone after each strum, or to pick out additional melody notes in what is known as "drop-thumb" or "double thumbing." Pete Seeger popularised a folk style by combining clawhammer with "up picking" without the use of fingerpicks.
In bluegrass music, which uses the five-string resonator banjo exclusively, it is often played in Scruggs style, named after Earl Scruggs, melodic or Keith style, or three-finger style with single string work, also called Reno style after Don Reno, legendary father of Don Wayne Reno. In these styles the emphasis is on arpeggiated figures played in a continuous eighth-note rhythm.
Many tunings are used for the five-string banjo. Probably the most common, particularly in bluegrass, is the open G tuning (gDGBd). In earlier times, the tuning gCGBd was commonly used instead. Other tunings common in old-time music include double C (gCGCd), sawmill or mountain minor (gDGCd) also called Modal or Mountain Modal, and open D (f#DF#Ad). These tunings are often taken up a tone, either by tuning up or using a capo.
The fifth (drone) string is the same gauge as the first, but it is five frets shorter, three quarters the length of the rest. This presents special problems for using a capo to change the pitch of the instrument. For small changes (going up or down one or two semitones, for example) it is possible to simply retune the fifth string. Otherwise various devices are available to effectively shorten the string. Many banjo players favour the use of model railroad spikes (usually installed at the seventh fret and sometimes at others), under which the string can be hooked to keep it pressed down on the fret.
A further development is the tenor banjo, which also has four strings and is also typically played with a plectrum. It has a shorter neck of 19 frets, and is usually tuned CGDA, like a viola, or GDAE, like a violin (but an octave lower). The tenor banjo has become a standard instrument for Irish traditional music, where is mainly used in its shorter 17 frets variant.
Eddie Peabody (plectrum), Harry Reser (tenor and plectrum) and Barney McKenna (irish tenor) are regarded as three of the best four-string banjo players of all time.
Instruments using the five-string banjo neck on a wooden body (for example, that of a bouzouki or resonator guitar) have also been made, though these are not so common. A 20th-Century Turkish instrument very similar to the banjo is called Cümbüs.
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