Bbaug11b9 Augmented
The Bbaug11b9 chord is built from the notes Bb – D – F# – Ab – Cb – D.
Piano sound loads on first tap.
Chord tones, one by one
BbRoot
Root
The fundamental note the chord is built on — Bb.
DThird
Major third
Four semitones — makes the chord major (brighter, happier).
F#Fifth
Augmented fifth (♯5)
Eight semitones — a sharp fifth. Restless and dreamy, typical of augmented chords.
AbSeventh
Minor seventh (♭7)
Ten semitones — the dominant/minor seventh. Adds bluesy tension (7, m7).
CbExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
DExtension
Extension (16 st)
An upper extension 16 semitones above the root.
🎼 Related scales
Altered (super-Locrian)melodic minor a semitone above
🎹 Modal analysis
This chord implies the Altered (super-Locrian) scale; its characteristic note is the ♭13, a dominant's maximum tension. It is a mode of the melodic minor a semitone above.
🎸 Genres
Modern jazz · Post-bop · Fusion