semitone(redirected from Septimal chromatic semitone)
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Related to Septimal chromatic semitone: whole tone, chromatic scale, diatonic scale, enharmonic, Circle of fifths, Diatonic semitone
the smallest interval in European music. In the modern system of temperament, all semitones are equal, and there are 12 semitones in an octave.
There are three types of semitones: diatonic, chromatic, and enharmonic. The diatonic semitone is an interval between adjacent steps of a scale (for example, B to C, D to E flat [a minor second]). The chromatic semitone is the interval between a foundation and its raised or lowered variant (for example, F to F sharp, an augmented prime). The enharmonic semitone is the interval formed by the alteration of adjacent steps—for example, F double sharp to A flat, a double-diminished third (seeINTERVAL).