Inclassical music from Western culture, a diminished sixth (Playⓘ) is an interval produced by narrowingaminor sixth by a chromatic semitone.[1][3] For example, the interval from A to F is a minor sixth, eight semitones wide, and both the intervals from A♯ to F, and from A to F♭ are diminished sixths, spanning seven semitones. Being diminished, it is considered a dissonant interval,[4] despite being equivalent to an interval known for its consonance.
| Inverse | augmented third |
|---|---|
| Name | |
| Other names | - |
| Abbreviation | d6[1] |
| Size | |
| Semitones | 7 |
| Interval class | 5 |
| Just interval | 192:125,[2] 32:21,49:32 |
| Cents | |
| 12-Tone equal temperament | 700 |
| 24-Tone equal temperament | 700 |
| Just intonation | 743 |
Its inversion is the augmented third, and its enharmonic equivalent is the perfect fifth.
A severely dissonant diminished sixth is observed when a fixed-pitch instrument limited to twelve notes per octave is tuned using Pythagorean tuning or a meantone temperament with a fifth flatter than 700 cents. Typically, this is the interval between G♯ and E♭. Since this interval was considerd to "howl like a wolf" (because of the beating), and since it sounded like a badly out-of-tune fifth, this interval is called the "wolf" fifth. Notice that a justly tuned fifth is the most consonant interval after the perfect unison and the perfect octave.