Often depicted in carvings c. 800 AD, the Norse hero Gunther (also patent as Gunnar), played a lute with his toes as he lay dying in a snake-pit, in the legend of Siegfried. By 1200 AD, the four string "guitar" had evolved into two types: the guitarra morisca (Moorish guitar) which had a rounded back, wide fingerboard and many soundholes, and the guitarra latina (Latin guitar) which resembled the modern guitar with one soundhole and a narrower neck.

• Frets are laid out to a mathematical ratio that results in level tempered division of the octave

• The ratio of the spacing of two consecutive frets is the twelfth root of two \sqrt{2}, whose numeric connotation is http://www.jhguitars.com/ about 1.059463
• The twelfth fret divides the range length in two exact halves and the 24th fret ground divides the extent length in section yet again.