In classical music, the tritone is a harmonic and melodic dissonance and is important in the study of musical harmony. In twelve-equal temperament, the tritone divides the octave exactly in half as 6 of 12 semitones or 600 of 1,200 cents. For instance, the above-mentioned C major scale contains the tritones F–B (from F to the B above it, also called augmented fourth) and B–F (from B to the F above it, also called diminished fifth, semidiapente, or semitritonus) the latter is decomposed as a semitone B–C, a whole tone C–D, a whole tone D–E, and a semitone E–F, for a total width of three whole tones, but composed as four steps in the scale. According to this definition, a diatonic scale contains two tritones for each octave. More broadly, a tritone is also commonly defined as any interval with a width of three whole tones (spanning six semitones in the chromatic scale), regardless of scale degrees. For instance, the above-mentioned interval F–B is the only tritone formed from the notes of the C major scale. Narrowly defined, each of these whole tones must be a step in the scale, so by this definition, within a diatonic scale there is only one tritone for each octave. For instance, the interval from F up to the B above it (in short, F–B) is a tritone as it can be decomposed into the three adjacent whole tones F–G, G–A, and A–B. In music theory, the tritone is defined as a musical interval composed of three adjacent whole tones (six semitones). Augmented fourth, diminished fifth, the Devil’s interval (obscure)
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