The E Flat Pythagorean Aeolian diminished 4 Scale. The 8192/6561 Pythagorean diminished fourth isn't an interval you hear every day. It has a completely different quality from the 81/64 Pythagorean major third (the "enharmonic equivalent" in equal temperament). The different harmonic shades of diminished 4ths and major thirds - even within the confines of a 3-limit just intonation system - highlights vast harmonic terrain that simple 100-cent semitones simply blur beyond recognition. The 19683/16384 augmented second between the diminished fourth and perfect fifth adds a nice contour to this scale.
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