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by HillOBeans 4431 days ago
Notice also that in major keys, there is only a half-step between the 3rd and the 4th tones, meaning the diminished 4th interval will sound as a major 3rd. The augmented 4th (or diminished 5th - a.k.a tritone) perfectly splits the octave in this tuning system. You can go up or down by an augmented 4th or diminished 5th as many times as you want and only ever be playing the same two note-names.