A Major 9th Guitar Chord
Voicing Positions (6)
Interval Colors
In shape.music, every interval has a unique color. The colors follow the function of each note relative to the root — so they change when you switch chords.
A Major 9th Chord
The A Major 9th chord is built from the intervals: Root, Major 2nd, Major 3rd, Perfect 5th, and Major 7th. It contains the notes A, B, C#, E, and G#. As an extended chord, it adds color and depth beyond the basic triad.
What A Major 9th Is
The A Major 9th is a major seventh chord — a major triad with the major seventh added on top. The major seventh sits a half-step below the octave, which gives the chord its hallmark dreamy, slightly suspended sound. Major seventh chords are central to jazz, bossa nova, R&B, and any genre interested in lush, sophisticated harmony.
How A Major 9th Sounds
A A Major 9th sounds simultaneously stable and slightly suspended. The major seventh creates a soft dissonance against the root that hangs in the air, which is why these chords sound so well in slow ballads, film scores, and any music that wants to feel reflective. They almost glow.
How To Use A Major 9th In A Progression
Major seventh chords most commonly appear as I and IV in major keys. In jazz, they are the resting points of phrases. A A Major 9th as a tonic chord lets the harmony sit while the melody and voicings move freely above it; used as IV, the major seventh adds reflective colour to a moment of harmonic stability before moving back to the tonic.
Playing A Major 9th On Guitar
On guitar, the most common voicings of A Major 9th use the open position when possible (which is why guitarists tend to favour keys like E, A, D, G, and C) and movable barre or half-barre shapes everywhere else. The voicing diagrams above show several practical positions across the neck — the open or low-fret voicings will sound brightest, while the higher voicings will have a thinner, more focused tone. Always experiment with which fingering serves the line you are playing.
Related Chords
Same quality (Major 9th)
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