Diminished (whole–half)
Whole and half steps alternating, starting with a whole — the classic scale over diminished chords.
C, crotchet; D, crotchet; E flat, crotchet; F, crotchet; G flat, crotchet; A flat, crotchet; A, crotchet; B, crotchet; C, crotchet
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C D E♭ F G♭ A♭ A B