G♭ Diminished 7th
Also Known As
Hear the G♭ Diminished 7th chord played for you.
G♭°7
G♭ – A – C – E♭
Formula:R-m3-d5-d7
Intervals:P1-m3-d5-d7
Scale Degrees:1-b3-b5-bb7
Introduction
The G♭ Diminished 7th chord is a four-note chord made up of G♭, A, C, and E♭. It is built from a root, minor third, diminished fifth, and diminished seventh.
The Gb Diminished 7th piano chord (Gbdim7) consists of the notes Gb, A, C, Eb. It is built by stacking three minor thirds, creating a fully symmetrical 4-note chord, giving it a extremely tense and dramatic character, fully symmetrical and harmonically versatile. Formula: R-m3-d5-d7 | Scale degrees: 1-b3-b5-bb7.
Notes
G♭ Diminished 7th Inversions
| Position | Notes |
|---|---|
| Root Position | Gb – A – C – Eb |
| 1st Inversion | A – C – Eb – Gb |
| 2nd Inversion | C – Eb – Gb – A |
| 3rd Inversion | Gb – A – C – Eb |
Key Signature
The key of Gb Diminished 7th has 6 flats.
B♭E♭A♭D♭G♭C♭
Order of flats
Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.
B♭E♭A♭D♭G♭C♭F♭
Mnemonic: Battle Ends And Down Goes Charles’ Father
Chords in the Key of Gb Major
These are the diatonic triads built on each degree of the Gb major scale:
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I — G♭ Major (major)
Theory: Intervals
Formula: R-m3-d5-d7
Intervals: P1-m3-d5-d7
The G♭ Diminished 7th is built by stacking intervals from the root note. The formula R-m3-d5-d7 describes the scale degrees used. The intervals P1-m3-d5-d7 show the distance between each note in the chord.
G♭ Diminished 7th — Frequently Asked Questions
What notes are in the Gb Diminished 7th chord?
The Gb Diminished 7th chord (Gbdim7) contains four notes: Gb (root), Bbb (minor third, enharmonically A), Dbb (diminished fifth, enharmonically C), and Fbb (diminished seventh, enharmonically Eb). All four notes are spaced exactly 3 semitones apart.
How does Gb Diminished 7th differ from Gb Diminished?
Gb Diminished is a three-note triad (Gb, Bbb, Dbb). Gb Diminished 7th adds Fbb/Eb as the diminished seventh, completing the symmetrical structure.
Why is the Diminished 7th chord symmetrical?
Gbdim7 contains the same pitches as Cdim7, Ebdim7, and Adim7 — all inversions of the same four notes (C, Eb, Gb, A). Only three unique dim7 chords exist.
How is Gb Diminished 7th used in music?
Gbdim7 functions as the vii°7 of G, resolving up by half step to G Major or G minor. Its enharmonic equivalent F#dim7 is more commonly written in sharp-key contexts.
What songs use Diminished 7th chords?
Diminished 7th chords appear in Michelle (Beatles), throughout Chopin and Beethoven, and in jazz standards for chromatic voice leading. Film scores use dim7 for suspense and dramatic tension.
How many unique Diminished 7th chords exist?
Only three. Gbdim7 shares its notes with Cdim7, Ebdim7, and Adim7. The other two unique groups are Dbdim7 and Ddim7.
Practice Tips
- Play Gbdim7 and Cdim7 back to back — same notes, confirming the three-chord symmetry rule.
- Gbdim7 resolves to G Major: try Gbdim7 → G for the classic leading-tone resolution.
- Gbdim7 and F#dim7 are enharmonic equivalents — practice recognizing both spellings.
- Use Gbdim7 as a chromatic passing chord between F and G chords for smooth voice leading.
- The enharmonic pitches (Gb–A–C–Eb) form a pattern that repeats every minor third across the keyboard.
- Compare Gbdim7 with Gbm7 — the diminished chord has maximum tension while the minor 7th is smooth and dark.
Related Tools
Chord FinderLook up any chord — see the notes, hear it, and play along.Chord DrillTimed drills to build speed and recognition across all chord types.Practice RoomPlug in a MIDI keyboard and get real-time feedback on every chord and scale.Circle of FifthsVisualize key relationships, relative minors, and key signatures.MIDI MonitorLive MIDI message stream with note names, velocity, and a scrolling staff.