Guitar Chord Amaj9: Structure, Notes and Theory

Amaj9 — a chord built on the note “A” with an airy, soft sound and a subtle shimmer in the upper register. Brings spaciousness and elegance to jazz and soul. Creates a sense of smoothness and harmonic width.

Formula and Structure of the Amaj9 Chord

Interval formula from the root note: 1 — 3 — 5 — 7 — 9. The chord consists of the following notes:

• A — unison and the main tonal anchor.
• Db — major third with a bright major quality and clear stability above the tonic.
• E — perfect fifth, stabilizing the triad and adding tonal grounding.
• Ab — major seventh with a smooth jazz sparkle and slight tension toward the octave.
• B — major ninth, opening the top line and adding airiness to the texture.

Together, these notes form the harmonic foundation of the Amaj9 chord, defining its sound and role in the musical context.

Alternative Names for the Amaj9 Chord

This chord may appear under different names:

• AΔ9

All variants refer to the same harmonic structure.

Using the Amaj9 Chord

Place the 9 in the top voice for light airiness. Avoid crowding with the 3 in the lower registers. Use for intros, codas, and transparent accompaniments. On guitar, the 9 can be held as a pedal tone, creating a soft backdrop over changing bass notes.

Conclusion

Amaj9 is an expressive and versatile chord. Learn several fingerings, experiment with different positions and voice spacing, then try weaving it into your own playing — this will help you quickly find your unique tone.