Inverse | neutral seventh | |
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Name | ||
Other names | ||
Abbreviation | n2 | |
Size | ||
Semitones | ~1½ | |
Interval class | ~1½ | |
Just interval | 11:10 or 12:11[1] | |
Cents | ||
Equal temperament | 100 or 200 | |
24 equal temperament | 150 | |
Just intonation | 165 or 151 |
A neutral second or medium second is a musical interval wider than a minor second and narrower than a major second. Three distinct intervals may be termed neutral seconds:
Roughly speaking, then, neutral seconds are a quarter tone sharp from minor seconds and a quarter tone flat from major seconds. The equal-tempered neutral second may be found in the quarter tone scale and in some traditional Arab music (see also Arab tone system). Because neutral seconds are essentially a semitone (minor second) plus a quarter-tone, they may be considered three-quarter tones.
Approximations to the 12:11 and 11:10 neutral seconds can be found in a number of equally-tempered tuning systems. 11:10 is very closely matched by 22-ET, whereas 12:11 is matched by 24-ET, 31-ET and 41-ET. 72-ET matches both intervals closely and is also the smallest widely used equal temperament that uniquely matches both intervals. Tuning systems that temper out the comma of 121:120 do not distinguish between the two intervals.
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