Diminished (half–whole)
Half and whole steps alternating, starting with a half — a tense jazz scale for dominant chords.
C, crotchet; D flat, crotchet; E flat, crotchet; E, crotchet; F sharp, crotchet; G, crotchet; A, crotchet; B flat, crotchet; C, crotchet
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C D♭ E♭ E F♯ G A B♭