Neutral interval
In music theory, a neutral interval is an interval that is neither a major nor minor, but instead in between. For example, in equal temperament, a major third is 400 cents, a minor third is 300 cents, and a neutral third is 350 cents. A neutral interval inverts to a neutral interval. For example, the inverse of a neutral third is a neutral sixth.
Roughly, neutral intervals are a quarter tone sharp from minor intervals and a quarter tone flat from major intervals. In just intonation, as well as in tunings such as 31-ET, 41-ET, or 72-ET, which more closely approximate just intonation, the intervals are closer together.
| minor | neutral | major | |
|---|---|---|---|
| seconds | D♭ | ≊ D | D♮ |
| thirds | E♭ | ≊ E | E♮ |
| sixths | A♭ | ≊ A | A♮ |
| sevenths | B♭ | ≊ B | B♮ |
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