The Pythagorean Ionian diminished 5 Scale. The diminished 5 alteration creates an interesting balance in otonal/utonal intervals. The straight just-intonation (in the case of a Pythagorean system, the 3-limit just system) typically has only one utonal member. In Ionian scales that is normally the 4/3 perfect fourth. The diminished fifth adds the utonal 1024/729, doubling the utonal count and shading the harmonic color toward the Mixolydian mode (where having 2 utonal pitches is the norm).
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