Bbmaj9(#13) Major 7th
The Bbmaj9(#13) chord is built from the notes Bb – D – F – A – C – Ab.
Piano sound loads on first tap.
Also known as
Bbmaj9(#15)
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).
FFifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
ASeventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
CExtension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
AbExtension
Extension (22 st)
An upper extension 22 semitones above the root.
🎼 Related scales
🎹 Modal analysis
This chord implies the Bebop dominant scale; its characteristic note is the passing natural 7th (bebop).
🎸 Genres
Bebop jazz · Straight-ahead jazz