Amaj9 Chord on Guitar
Amaj9 = A – C# – E – G# – B (Root, Major 3rd, Perfect 5th, Major 7th, Major 9th)
A major 9 layers a ninth on top of a full major seventh chord, producing one of the lushest, most harmonically saturated sounds an A-rooted barre chord can make at the fifth fret. It's built from the same reduced guitar approach used for the chord's other extended relatives — the fifth is dropped to keep the essential tones playable.
The full chord is A, C#, E, G#, B — root, major third, fifth, major seventh, ninth — though the guitar voicing here keeps mainly root, third, seventh, and ninth. Unlike A9, which includes a flat seventh and pulls hard toward D major as a dominant chord, Amaj9 keeps the major seventh and functions as a fully stable, resting tonic chord — there's no unresolved tension here at all, just a wash of major color. That distinction (maj9 as a point of rest, 9 as a point of departure) is one of the more important things to internalize about extended chords in general.
Fingerings
Barre (5th fret)
How to Practice It
Play A major, Amaj7, and Amaj9 in sequence to hear how each added tone thickens the chord's color while it stays fully at rest the entire time — none of these three chords pulls anywhere. Pay attention to how different that stillness feels compared to A9's forward motion; confusing the two is a common early mistake since the fingerings and names look deceptively close.
Common Progressions
- Amaj9 – D (I maj9 – IV, a lush stationary opening)
- F#m7 – Amaj9 – D (vi7 – I maj9 – IV, a smooth jazz-pop turnaround)
- Amaj9 – E/A – Amaj9 (a static, ambient-leaning vamp on the tonic)
- D – Amaj9 – F#m7 (IV – I maj9 – vi7)
FAQ
- What's the difference between Amaj9 and A9?
- Amaj9 keeps the major seventh (G#) and adds a ninth, staying fully stable and resolved, while A9 uses a flat seventh (G) instead, making it a dominant chord that pulls strongly toward D major rather than sitting at rest.
- Is Amaj9 a chord that resolves somewhere?
- No — it's a stable tonic-family color chord, not a chord built around tension, so it can sit comfortably as a resting point in a progression rather than pushing toward any particular resolution.
- Why does Amaj9 sound so lush?
- Stacking the major seventh and ninth on top of a plain triad fills in the harmonic space with closely related, consonant tones, producing a rich, layered sound without introducing any actual dissonance — a texture favored heavily in jazz, R&B, and neo-soul.
- Does the guitar voicing of Amaj9 include every note?
- No — like most extended chords on guitar, the fifth is dropped to keep the shape playable, leaving root, major third, major seventh, and ninth as the notes that carry the chord's identity.
- Is Amaj9 hard to finger at the fifth fret?
- It requires a comparable stretch to Amaj7 with one additional fretted note for the ninth, so it's a reasonable step up once the plain major-seventh barre feels comfortable.
- Why might a songwriter choose Amaj9 over plain A major for a verse?
- The added color creates a more atmospheric, less plainly 'strummed' sound that suits slower, more textured arrangements, which is why maj9 chords show up so often in dreamier or more jazz-influenced pop and R&B writing.
- How can a player avoid confusing Amaj9 with A9 by ear?
- Listen for whether the chord feels like it's asking to move somewhere — A9's flat seventh creates a clear pull toward D major, while Amaj9's major seventh leaves the chord sounding settled and complete on its own.
Amaj9 on other instruments: Amaj9 on Piano. Related: how chords are built, chord finder.