The D♭ Diminished 7th chord is a four-note chord made up of D♭, F♭, A♭♭, and C♭♭. It is built from a root, minor third, diminished fifth, and diminished seventh.
Construction
D♭ Diminished 7th = Root + Minor 3rd + Diminished 5th + Major 6th = D♭ · F♭ · A♭♭ · C♭♭
| Note | Interval | Degree |
|---|---|---|
| D♭ | Root | 1 |
| F♭ | Minor 3rd | ♭3 |
| A♭♭ | Diminished 5th | ♭5 |
| C♭♭ | Major 6th | 6 |
D♭ Diminished 7th Inversions
| Position | Notes |
|---|---|
| Root Position | D♭ – F♭ – A♭♭ – C♭♭ |
| 1st Inversion | F♭ – A♭♭ – C♭♭ – D♭ |
| 2nd Inversion | A♭♭ – C♭♭ – D♭ – F♭ |
| 3rd Inversion | C♭♭ – D♭ – F♭ – A♭♭ |
Key Signature
A Diminished 7th chord is built from symmetrical or ambiguous intervals, so it doesn’t belong to a single key and has no key signature of its own.
Same Notes, Other Names
The notes D♭ – F♭ – A♭♭ – C♭♭ aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell the following:
D♭ Diminished 7th — Frequently Asked Questions
What is the D♭ Diminished 7th chord on piano?
The D♭ Diminished 7th chord contains the notes D♭ – F♭ – A♭♭ – C♭♭. On piano, play these notes together to sound the chord.
What notes are in the Db Diminished 7th chord?
The Db Diminished 7th chord (Dbdim7) contains four notes: Db (root), Fb (minor third), Abb (diminished fifth), and Cbb (diminished seventh). Enharmonically: Db, E, G, Bb. All four notes are spaced exactly 3 semitones apart.
How does Db Diminished 7th differ from Db Diminished?
Db Diminished is a three-note triad (Db, Fb, Abb). Db Diminished 7th adds a fourth note — Cbb (diminished seventh). This completes the symmetrical structure and increases the harmonic tension.
Why is the Diminished 7th chord symmetrical?
Every note in Dbdim7 is exactly 3 semitones from the next. This means Dbdim7 = Edim7 = Gdim7 = Bbdim7 — all the same four notes rearranged. Only three unique diminished 7th chords exist in total.
How is Db Diminished 7th used in music?
Dbdim7 commonly functions as a passing chord or leading-tone chord. As the vii°7 of D, it resolves beautifully up by half step to D Major or D minor. It also works as a chromatic approach chord to any of its enharmonic roots.
What songs use Diminished 7th chords?
Diminished 7th chords appear in Michelle (Beatles), throughout Chopin and Beethoven for dramatic tension, and in jazz standards for chromatic passing movement. Silent film scores used dim7 extensively for suspense.
How many unique Diminished 7th chords exist?
Only three. Dbdim7 is the same chord as Edim7, Gdim7, and Bbdim7 — just different inversions. All 12 roots map to just three distinct sounds because of the perfect 3-semitone symmetry.