Gb(b13b9) Dominant 7th
The Gb(b13b9) chord is built from the notes Gb – Bb – Db – Fb – Abb – Ebb.
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Also known as
Gb7(b9,b13)Gb7b13b9Gb7b9b13Gbb13b9Gbb9b13
Chord tones, one by one
GbRoot
Root
The fundamental note the chord is built on — Gb.
BbThird
Major third
Four semitones — makes the chord major (brighter, happier).
DbFifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
FbSeventh
Minor seventh (♭7)
Ten semitones — the dominant/minor seventh. Adds bluesy tension (7, m7).
AbbExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
EbbExtension
Flat thirteenth (♭13)
A ♭13 — dark altered tension over a dominant chord.
🎼 Related scales
Phrygian dominantharmonic minor a perfect 5th below
🎹 Modal analysis
This chord implies the Phrygian dominant scale; its characteristic note is the ♭9 / ♭2. It is a mode of the harmonic minor a perfect 5th below.
🎸 Genres
Flamenco · Middle-Eastern · Klezmer · Neoclassical metal