Abm(maj7b5#9) Diminished
The Abm(maj7b5#9) chord is built from the notes Ab – Cb – Ebb – G – B.
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Chord tones, one by one
AbRoot
Root
The fundamental note the chord is built on — Ab.
CbThird
Minor third
Three semitones — makes the chord minor (darker, sadder).
EbbFifth
Diminished fifth (♭5)
Six semitones — a flat fifth. Creates instability, typical of m7♭5 and diminished chords.
GSeventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
BExtension
Sharp ninth (♯9)
A ♯9 — the gritty 'Hendrix' tension over a dominant chord.
🎼 Related scales
🎹 Modal analysis
This chord implies the Whole-half diminished scale.
🎸 Genres
Bebop jazz · Hard bop · Gypsy jazz