Guitar · seventh flat nine
A7♭9 Chord on Guitar
A Dominant 7♭9 is A, C#, E, G, Bb — the 1-3-5-b7-b9 pattern of a seventh flat nine chord. There are 2 ways to play it on guitar, ranked below from easiest to hardest.
There is no open A7b9 shape on guitar — every version sits up the neck. The one marked “E Shape Barre (5th fret)” below is the friendliest grip, so start there.
Start here — 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.
E Shape Barre (5th fret) Way 1 of 2
E Shape Barre (5th fret)
Easiest here· 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.
Movable Root-5 Shape (11th fret) Way 2 of 2
Movable Root-5 Shape (11th fret)
advanced
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.
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.
A7b9 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.
A7b9 on Guitar — questions people ask
What is the easiest way to play A7b9 on guitar?
“E Shape Barre (5th fret)” — which we rate advanced — is the easiest A7b9 shape on guitar. 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. There is no open A7b9 on guitar, so a barre is unavoidable; this is the least demanding one.
What notes are in the A Dominant 7♭9 chord?
A Dominant 7♭9 is A, C#, E, G, Bb — the 1-3-5-b7-b9 interval pattern of a seventh flat nine 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 A7b9 on guitar?
This page has 2 A7b9 voicings for guitar, ranked from easiest to hardest: E Shape Barre (5th fret), Movable Root-5 Shape (11th fret). They all sound like A7b9; the differences are how hard they are to hold and how high they sit.
What can I play instead of A7b9?
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 A7b9 on other instruments?
Yes. A7b9 is the same set of notes everywhere; only the fingering changes. This site has diagrams and audio for it on piano.
Learn the theory behind A7b9
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.
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Functional Harmony: Three Roles, One Engine
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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.
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