Gbmaj13b9 Major 7th
The Gbmaj13b9 chord is built from the notes Gb – Bb – Db – F – Abb – Eb.
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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.
FSeventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
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
🎹 Modal analysis
This chord implies the Lydian ♭2 scale; its characteristic note is the ♭9 / ♭2.
🎸 Genres
Modern jazz · Post-bop · Fusion