Guitar · ninth
A9 Chord on Guitar
A Dominant 9th is A, C#, E, G, B — the 1-3-5-b7-9 pattern of a ninth chord. There are 2 ways to play it on guitar, ranked below from easiest to hardest.
There is no open A9 shape on guitar — every version sits up the neck. The one marked “Movable Root-5 Shape (11th fret)” below is the friendliest grip, so start there.
The shape most players use — E Shape Barre (5th fret)
Barre at fret 5 — the same movable idea, further up the neck: brighter, more compact, and easier to reach if you are already playing up there.
Every way to play it — 2 shapes, easiest first
Same chord in all of them. What changes is how much your hand has to do and where on the neck it sits.
Movable Root-5 Shape (11th fret) Way 1 of 2
Movable Root-5 Shape (11th fret)
Easiest here· intermediate
Sits at fret 11 — tighter and brighter than the low shapes, and high enough to keep out of the way of anyone playing the open version underneath.
E Shape Barre (5th fret) Way 2 of 2
E Shape Barre (5th fret)
advanced· the standard shape
Barre at fret 5 — the same movable idea, further up the neck: brighter, more compact, and easier to reach if you are already playing up there.
What beginners get wrong
Moving in and out of it
The shape above: E Shape Barre (5th fret) — barred at fret 5.
Listening: each shape above has its own play button, and each one plays the notes that shape actually produces — not a generic triad.
A9 on other instruments
Same notes, different hands. Every link below is a real page with diagrams and audio.
Chords next door
Same root, different colour — and all of them playable on guitar.
A9 on Guitar — questions people ask
What is the easiest way to play A9 on guitar?
“Movable Root-5 Shape (11th fret)” — which we rate intermediate — is the easiest A9 shape on guitar. Sits at fret 11 — tighter and brighter than the low shapes, and high enough to keep out of the way of anyone playing the open version underneath. There is no open A9 on guitar, so a barre is unavoidable; this is the least demanding one.
What notes are in the A Dominant 9th chord?
A Dominant 9th is A, C#, E, G, B — the 1-3-5-b7-9 interval pattern of a ninth chord. Every voicing on this page uses those notes and nothing else; they just appear in a different order and octave.
How many ways can you play A9 on guitar?
This page has 2 A9 voicings for guitar, ranked from easiest to hardest: Movable Root-5 Shape (11th fret), E Shape Barre (5th fret). They all sound like A9; the differences are how hard they are to hold and how high they sit.
What can I play instead of A9?
The nearest stand-ins on guitar that keep the same root are Asus4, Asus2, A. They keep the root and the fifth and only change what sits in the middle, so most songs still work — but check the swap against the melody, because the note you removed may be the one the tune is singing.
Can I play A9 on other instruments?
Yes. A9 is the same set of notes everywhere; only the fingering changes. This site has diagrams and audio for it on piano, ukulele, mandolin.
Learn the theory behind A9
The shape gets your fingers there. These explain why it sounds the way it does.
Barre Chords — The Wall Every Guitarist Climbs
This one asks for a barre. The article is the fix for the buzzing and the aching hand.
7 min read
Functional Harmony: Three Roles, One Engine
What a seventh chord is for — tension, resolution, and the seat it takes in the key.
6 min read
The 12-Bar Blues — Three Chords, A Century of Hits
Seventh chords are the whole sound of the blues. Twelve bars is where to hear it.
7 min read