Whole-Half Diminished Scales on Piano

The whole-half diminished scale is an eight-note (octatonic) scale that alternates whole steps and half steps. It maps perfectly onto diminished seventh chords and is the primary improvisational tool for soloing over dim7 harmony. Because of its symmetrical construction — repeating every minor third — only three distinct whole-half diminished scales exist.

Formula: W–H–W–H–W–H–W–H (alternating whole and half steps)

Intervals: P1–M2–m3–P4–d5–m6–M6–M7–P8

Scale degrees: 1–2–♭3–4–♭5–♭6–6–7

Sound: Symmetrical, tense, mysterious, classical

Also known as: Diminished scale (when starting W–H), octatonic scale, Messiaen mode 2

Only three unique scales: Because the pattern repeats every minor third, the C whole-half diminished scale contains the same notes as E♭, G♭, and A whole-half diminished. So there are only three distinct pitch collections: one starting on C, one on D♭, and one on D. Every other starting note is a rotation of one of these three.