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Septimal major second

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Title: Septimal major second  
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Subject: List of pitch intervals, List of meantone intervals
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Septimal major second

septimal major second
Inverse harmonic seventh
Other names Septimal whole tone, Supermajor second
Abbreviation S2, SM2
Semitones ~2.5
Interval class ~2.5
Just interval 8:7[1]
Equal temperament 200
24 equal temperament 250
Just intonation 231

In music, the septimal whole tone, septimal major second,harmonic seventh.

No close approximation to this interval exists in the standard 12 equal temperament used in most modern western music. 26 equal temperament matches this interval almost perfectly with an error of only 0.4 cents, but at the cost of the significant flatness of its major thirds and fifths. 31 equal temperament, which has much more accurate fifths and major thirds, approximates 8/7 with a slightly higher error of 1.1 cents.


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