Gbdim13(b9) Diminished
The Gbdim13(b9) chord is built from the notes Gb – Bbb – Dbb – Fbb – Abb – Eb.
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Chord tones, one by one
GbRoot
Root
The fundamental note the chord is built on — Gb.
BbbThird
Minor third
Three semitones — makes the chord minor (darker, sadder).
DbbFifth
Diminished fifth (♭5)
Six semitones — a flat fifth. Creates instability, typical of m7♭5 and diminished chords.
FbbSeventh
Diminished seventh (♭♭7)
Nine semitones — a doubly-flat seventh, found in fully diminished 7th chords.
AbbExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
EbExtension
Thirteenth (13)
A 13th — full, rich top extension.
🎼 Related scales
Locrian ♮6harmonic minor a semitone below
🎹 Modal analysis
This chord implies the Locrian ♮6 scale; its characteristic note is the natural 6th over a diminished chord. It is a mode of the harmonic minor a semitone below.
🎸 Genres
Modern jazz · Post-bop · Fusion