Guitar Frets are laid out to accomplish an equal tempered division of the octave. Each set of twelve frets represents an octave. The twelfth fret divides the scale length exactly into two halves, and the 24th fret position divides one of those halves in half again. The ratio of the spacing of two consecutive frets is formula_1 (twelfth root of two). In practice, luthiers determine fret positions using the constant 17.817—an approximation to 1/(1-1/formula_1). If the nth fret is a distance x from the bridge, then the distance from the (n+1)th fret to the bridge is x-(x/17.817). Frets are available in
Banjo guitar keys, but also only five strings the short fifth string going up a hole at the 5th fret up a channel under the fingerboard, an through a hole in the headstock to a tuning roller. Banjo guitar Banjo guitar or Banjitar is a six-string banjo tuned in the standard tuning of a six-string guitar (E2-A2-D3-G3-B3-E4) from lowest to highest strings.. The six-string banjo was introduced in the late 19th century. Less widespread than four- and five-string banjos, it was reintroduced in the latter part of the twentieth century with the modern guitar-like tuning. The six-string "banjo guitar" should not be