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2. Meantone temperament - Wikipedia

   en.wikipedia.org/wiki/Meantone_temperament

   Twelve-tone equal temperament (12 TET) is obtained by making all semitones the same size, with each equal to one-twelfth of an octave; i.e. with ratios 12 √ 2 : 1. Relative to Pythagorean tuning , it narrows the perfect fifths by about 2 cents or ⁠ 1 / 12 ⁠ th of a Pythagorean comma to give a frequency ratio of 2 7 / 12 : 1 {\displaystyle ...

3. Pythagorean tuning - Wikipedia

   en.wikipedia.org/wiki/Pythagorean_tuning

   12-tone Pythagorean temperament is based on a sequence of perfect fifths, each tuned in the ratio 3:2, the next simplest ratio after 2:1 (the octave). Starting from D for example (D-based tuning), six other notes are produced by moving six times a ratio 3:2 up, and the remaining ones by moving the same ratio down:

4. Equal temperament - Wikipedia

   en.wikipedia.org/wiki/Equal_temperament

   12 tone equal temperament chromatic scale on C, one full octave ascending, notated only with sharps. Play ascending and descending ⓘ. An equal temperament is a musical temperament or tuning system that approximates just intervals by dividing an octave (or other interval) into steps such that the ratio of the frequencies of any adjacent pair of notes is the same.

5. Quarter-comma meantone - Wikipedia

   en.wikipedia.org/wiki/Quarter-comma_meantone

   The actual notes in a fully implemented quarter-comma scale (requiring about 31 keys per octave instead of only 12) would be consonant, like all of the uncolored intervals: The dissonance is the consequence of replacing the correct quarter-comma notes with wrong notes that happen to be assigned to the same key on the 12 tone keyboard. As ...

6. 12 equal temperament - Wikipedia

   en.wikipedia.org/wiki/12_equal_temperament

   12-tone equal temperament chromatic scale on C, one full octave ascending, notated only with sharps. Play ascending and descending ⓘ. 12 equal temperament (12-ET) [a] is the musical system that divides the octave into 12 parts, all of which are equally tempered (equally spaced) on a logarithmic scale, with a ratio equal to the 12th root of 2 (≈ 1.05946).

7. Musical temperament - Wikipedia

   en.wikipedia.org/wiki/Musical_temperament

   This phenomenon gives rise to infinite shades of key-colors, which are lost in the modern standard version: 12-tone equal temperament (12-TET). Unlike meantone temperament, which alters the fifth to "temper out" the syntonic comma, 12-TET tempers out the Pythagorean comma, thus creating a cycle of fifths that repeats itself exactly after 12 steps.

8. Circle of fifths - Wikipedia

   en.wikipedia.org/wiki/Circle_of_fifths

   In music theory, the circle of fifths (sometimes also cycle of fifths) is a way of organizing pitches as a sequence of perfect fifths. Starting on a C, and using the standard system of tuning for Western music (12-tone equal temperament), the sequence is: C, G, D, A, E, B, F ♯ /G ♭, C ♯ /D ♭, G ♯ /A ♭, D ♯ /E ♭, A ♯ /B ♭, F ...

9. Wolf interval - Wikipedia

   en.wikipedia.org/wiki/Wolf_interval

   In terms of frequency ratios, in order to close the circle of fifths, the product of the fifths' ratios must be 128 (since the twelve fifths, if closed in a circle, span seven octaves exactly; an octave is 2:1, and 2 7 = 128), and if f is the size of a fifth, 128 : f 11, or f 11 : 128, will be the size of the wolf.