Cmaj13b9 Major 7th
The Cmaj13b9 chord is built from the notes C – E – G – B – Db – A.
Piano sound loads on first tap.
Chord tones, one by one
CRoot
Root
The fundamental note the chord is built on — C.
EThird
Major third
Four semitones — makes the chord major (brighter, happier).
GFifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
BSeventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
DbExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
AExtension
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