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Caug7♭9/B♭ guitar shapes

Popular fretboard positions with fingering suggestions

Showing 8 of 11 playable shapes

About the chord

C augmented 7th flat 9th / B♭ (3rd inversion)

The C augmented 7th flat 9th augmented 7th flat 9th chord blends the augmented triad with a minor seventh and flat ninth D♭, producing a complex, dramatic tension. Its dissonant, unresolved sound is ideal for jazz and film scoring. With B♭ in the bass, this voicing functions as the 3rd inversion of C augmented 7th flat 9th.

Root note: C
Bass note: B♭
Chord tones: 5
Playable shapes: 11

Chord tones

CEG♯B♭D♭

Notes & Intervals

Each note below shows how the chord is built from its root. This is the theory layer underneath the fretboard shapes.

C Unison (Root) 1

The root anchors the chord and defines its tonal center.

E Major Third 3

This note defines the chord's major quality and brings brightness to the sound.

G♯ Augmented Fifth ♯5

The raised fifth adds lift, drama, and a more unsettled color.

B♭ Minor Seventh ♭7

The minor seventh adds bluesy or jazzy tension that wants to move onward.

D♭ Minor Ninth ♭9

The flat ninth adds sharper tension and a more dramatic clash.

Related Articles

Articles that reference this chord and explain how to use it in your playing.