Popular fretboard positions with fingering suggestions
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Amaj9/B is the A major 9 / B (4th inversion) guitar chord with B in the bass. It uses the notes A, C♯, E, G♯, and B and the interval formula 1-3-5-7-9.
The A major 9 major 9 chord adds a major ninth B to the major 7th, creating an expansive, ethereal sound. Its rich harmonic structure enhances the major tonality with a modern, sophisticated vibe, ideal for jazz, ambient, and cinematic music. With B in the bass, this voicing functions as the 4th inversion of A major 9.
Also written as Amaj9 and AM9/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 fifth reinforces stability and gives the chord its strong harmonic frame.
The major seventh adds a smooth, lush tension close to the root.
The ninth opens the chord up and adds a modern, spacious color.
Every shape is shown with its diagram and exact fingering instructions.
Amaj9/B uses the notes A, C♯, E, G♯, and B. Its interval formula is 1-3-5-7-9.
Amaj9/B is also written as Amaj9 and AM9/B.
Place the 1st finger on the 2nd fret of the 2nd string, 3rd string, 4th string, and 5th string in barre position. Place the 3rd finger on the 4th fret of the 1st string. Strum from the 5th string down.
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