Classical guitar fingerboard and placed at points that divide the length of string mathematically. The strings' vibrating length is determined when the strings are pressed down behind the frets. Each fret produces a different pitch and each pitch spaced a half-step apart on the 12 tone scale. The ratio of the widths of two consecutive frets is the twelfth root of two (formula_1), whose numeric value is about 1.059463. The twelfth fret divides the string in two exact halves and the 24th fret (if present) divides the string in half yet again. Every twelve frets represents one octave. This arrangement of frets
Romantic guitar mainly used for plucking with, in the 19th century, a free stroke ("tirando") more commonly than the rest stroke ("apoyando") that was favoured in the 20th century. Unlike most classical guitarists today, players were divided as to whether or not use fingernails. Fernando Sor, for example, did not use them while his compatriot Dionisio Aguado did. The narrower fretboard of the romantic guitar allowed the left-hand thumb to be used by some guitarists to fret the sixth string although Fernando Sor deprecates this in his method, recommending that the left-hand thumb remain at the rear centre of the neck and