Popular fretboard positions with fingering suggestions
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Caug7/B♭ is the C augmented 7th / B♭ (3rd inversion) guitar chord with B♭ in the bass. It uses the notes C, E, G♯, and B♭ and the interval formula 1-3-♯5-♭7.
The C augmented 7th augmented 7th chord combines the augmented triad with a minor seventh B♭, creating a powerful, dissonant tension. Its bold, unresolved sound is frequently used in jazz, blues, and film scores for dramatic impact. With B♭ in the bass, this voicing functions as the 3rd inversion of C augmented 7th.
Also written as Caug7, C7♯5/B♭, C+7/B♭, and C7+5/B♭.
These are quick-start shapes for players who want the answer first and the deeper theory second.
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Each note below shows how the chord is built from its root. This is the theory layer underneath the fretboard shapes.
The root anchors the chord and defines its tonal center.
This note defines the chord's major quality and brings brightness to the sound.
The raised fifth adds lift, drama, and a more unsettled color.
The minor seventh adds bluesy or jazzy tension that wants to move onward.
Every shape is shown with its diagram and exact fingering instructions.
Caug7/B♭ uses the notes C, E, G♯, and B♭. Its interval formula is 1-3-♯5-♭7.
Caug7/B♭ is also written as Caug7, C7♯5/B♭, C+7/B♭, and C7+5/B♭.
Place the 1st finger on the 1st fret of the 2nd string, 3rd string, and 5th string in barre position. Place the 2nd finger on the 2nd fret of the 4th string. Let the first string ring open. Strum from the 5th string down.
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