Septimal chromatic semitone
In music, a septimal chromatic semitone or minor semitone[1] is the interval 21:20 (
The septimal chromatic semitone equals a 25:24 just chromatic semitone plus a septimal semicomma (the interval 126:125).
When added to the 15:14 semitone, the 21:20 semitone and 28:27 semitone produce the 9:8 tone (major tone) and 10:9 tone (minor tone), respectively.
References
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