Gbmmaj13b9 Minor-Major 7th
The Gbmmaj13b9 chord is built from the notes Gb – Bbb – Db – F – Abb – Cb.
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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).
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.
CbExtension
Eleventh (11)
An 11th — a suspended, airy color on top of the chord.
🎼 Related scales
🎹 Modal analysis
This chord implies the Neapolitan major scale; its characteristic note is the ♭9 / ♭2.
🎸 Genres
Classical · Cinematic · Tango