D Half Whole Diminished — Organ

D Half Whole Diminished carries 8 notes per octave (symmetric family), drawn here straight onto the Organ's keys with every root pinned — no tablature in between, the keyboard is the map.

Tense, symmetrical, and slightly sinister — alternating half and whole steps pack in the b9, #9, #11, and 13, so it sounds like a dominant chord stretched to breaking point. Edgy, jazzy, and restless.

Heard in: Jazz lines over 13b9 dominant chords, fusion, film-noir and horror scoring — the sound of a V chord that refuses to settle.

The Organ ignores touch: every key speaks at one level, so evenness here is about timing alone — the maps and the audio keep that honest.