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Chords › Cdim7
Which scales on a diminished seventh chord?
The diminished seventh chord stacks minor thirds. Its symmetry calls for the whole-half diminished scale, which covers it completely.
Cdim7 = C · Eb · Gb · Bbb
guide tones (3rd & 7th) avoid
The core scale
whole-half diminished — whole/half diminished
RC 9D b3Eb 11F b5Gb b13Ab bb7Bbb 7B
A symmetric octatonic scale starting with a whole step: b3, b5, bb7 plus the major seventh, the complete sound of dim7 and its tensions. The reflex on diminished chords, perfect for chromatic motifs that transpose by minor third after minor third.