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17 equal temperament
Musical tuning system with 17 pitches equally-spaced on a logarithmic scale From Wikipedia, the free encyclopedia
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In music, 17 equal temperament is the tempered scale derived by dividing the octave into 17 equal steps (equal frequency ratios). Each step represents a frequency ratio of 17√2, 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 (look for the label "17-TET").
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History and use
Alexander J. Ellis refers to a tuning of seventeen tones based on perfect fourths and fifths as the Arabic scale.[2] 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.[citation needed]
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Notation

Easley Blackwood Jr. created a notation system where sharps and flats raised/lowered 2 steps. This yields the chromatic scale:
- C, D♭, C♯, D, E♭, D♯, E, F, G♭, F♯, G, A♭, G♯, A, B♭, A♯, B, C
Quarter tone sharps and flats can also be used, yielding the following chromatic scale:
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Interval size
Summarize
Perspective
Below are some intervals in 17 EDO compared to just.

17 EDO | |
just | |
12 EDO |

Relation to 34 EDO
17 EDO is a subset of 34 EDO, equivalent to every other step in the 34 EDO scale.
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