C#-6(#5b9) Augmented
The C#-6(#5b9) chord is built from the notes C# – E – G## – A# – D.
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Also known as
C#m6(#5b9)
Chord tones, one by one
C#Root
Root
The fundamental note the chord is built on — C#.
EThird
Minor third
Three semitones — makes the chord minor (darker, sadder).
G##Fifth
Augmented fifth (♯5)
Eight semitones — a sharp fifth. Restless and dreamy, typical of augmented chords.
A#Extension
Thirteenth (13)
A 13th — full, rich top extension.
DExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
🎼 Related scales
Locrian ♭♭7harmonic major scale
🎹 Modal analysis
This chord implies the Locrian ♭♭7 scale; its characteristic note is the ♭♭7 (enharmonic major 6th). It is a mode of the harmonic major scale.
🎸 Genres
Modern jazz · Post-bop · Fusion