17 equal temperament
In music, 17 equal temperament is the tempered scale derived by dividing the octave into 17 equal steps. Each step represents a frequency ratio of, or 70.6 cents.
17-ET is the tuning of the regular diatonic tuning in which the tempered perfect fifth is equal to 705.88 cents, as shown in Figure 1.
History and use
refers to a tuning of seventeen tones based on perfect fourths and fifths as the Arabic scale. In the thirteenth century, Middle-Eastern musician Safi al-Din Urmawi developed a theoretical system of seventeen tones to describe Arabic and Persian music, although the tones were not equally spaced. This 17-tone system remained the primary theoretical system until the development of the quarter tone scale.Notation
created a notation system where sharps and flats raised/lowered 2 steps, identical to ups and downs notation for 17-EDO.This yields the chromatic scale:
Quarter tone sharps and flats can also be used, yielding the following chromatic scale:
Interval size
Below are some intervals in compared to just.File:Simple I-IV-V-I isomorphic 17-TET.png|thumb|center|upright=1.4|I–IV–V–I chord progression in.
Whereas in B is 11 steps, in B is 16 steps.