Popular fretboard positions with fingering suggestions
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B9/A is the B9 / A (3rd inversion) guitar chord with A in the bass. It uses the notes B, D♯, F♯, A, and C♯ and the interval formula 1-3-5-♭7-9.
The B9 dominant 9 chord enriches the dominant 7th by adding a major ninth C♯, enhancing its tension with a colorful, jazzy flair. This extended harmony adds sophistication, frequently used in jazz, blues, and funk for dynamic progressions. With A in the bass, this voicing functions as the 3rd inversion of B9.
Also written as B9 and Bdom9/A.
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 fifth reinforces stability and gives the chord its strong harmonic frame.
The minor seventh adds bluesy or jazzy tension that wants to move onward.
The ninth opens the chord up and adds a modern, spacious color.
Every shape is shown with its diagram and exact fingering instructions.
B9/A uses the notes B, D♯, F♯, A, and C♯. Its interval formula is 1-3-5-♭7-9.
B9/A is also written as B9 and Bdom9/A.
Place the 1st finger on the 4th fret of the 2nd string, 3rd string, 4th string, and 5th string in barre position. Place the 2nd finger on the 5th fret of the 6th string. Place the 3rd finger on the 5th fret of the 1st string. Strum from the 6th string down.
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