C9#5b13 Augmented
The C9#5b13 chord is built from the notes C – E – G# – Bb – D – Ab.
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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).
G#Fifth
Augmented fifth (♯5)
Eight semitones — a sharp fifth. Restless and dreamy, typical of augmented chords.
BbSeventh
Minor seventh (♭7)
Ten semitones — the dominant/minor seventh. Adds bluesy tension (7, m7).
DExtension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
AbExtension
Flat thirteenth (♭13)
A ♭13 — dark altered tension over a dominant chord.
🎼 Related scales
🎹 Modal analysis
This chord implies the Whole tone scale; its characteristic note is the dreamy, suspended ♯5.
🎸 Genres
Impressionism · Film & TV scoring · Jazz