Septimal chromatic semitone
In music, a septimal chromatic semitone or minor semitone is the interval 21:20 (Play (help·info)). It is about 84.47 cents. The septimal chromatic semitone may be derived from the harmonic series as the interval between the twentieth and twenty-first harmonics.
The septimal chromatic semitone equals a 25:24 just chromatic semitone plus a septimal semicomma (the interval 126:125).
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