Ddim7
D Diminished 7th — perfectly symmetrical stacked minor thirds — the ultimate passing chord, able to resolve almost anywhere.
The keys
D – F – A♭ – C♭
What's inside Ddim7
| Note | Interval from root | Degree |
|---|---|---|
| D | Root | 1 |
| F | Minor 3rd | b3 |
| A♭ | Diminished 5th | b5 |
| C♭ | Diminished 7th | bb7 |
Inversions
| Position | Keys (low → high) |
|---|---|
| Root position | D4 – F4 – A♭4 – B4 |
| 1st inversion | F4 – A♭4 – B4 – D5 |
| 2nd inversion | A♭4 – B4 – D5 – F5 |
| 3rd inversion | B4 – D5 – F5 – A♭5 |
A working voicing
Split the chord between two hands the way working players do — a solid shell low down, the colour tones up top:
| Hand | Keys |
|---|---|
| Left (shell) | D2 – B2 |
| Right (colour) | F4 – A♭4 |
Where Ddim7 lives
As the ii chord
Ddim7 → G7 → Cmaj7
Minor-family sevenths live on the ii — this is the move they were born for.
Stepwise colour
D → Ddim7 → Em7
Used as a passing colour between neighbouring chords.
Put Ddim7 under your fingers
Hear every voicing, see the keys light up, and drill it in the interactive Chord & Voicing Lab.
Open the Chord & Voicing Lab →