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An interactive reference for guitar chord shapes, voicings and the theory behind them.

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  1. Chords
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  3. A
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  5. m9

A minor 9th (Am9)

ARoot
Cmin 3
EPerf 5
Gmin 7
B9

Smooth and sophisticated. Minor 7 with added 9th. Essential in jazz for mellow, rich harmonic color.

Notes
ACEGB
Formula
1 · ♭3 · 5 · ♭7 · 9
Type
Extended chord
03

How to play it

EADGBe241312345

Am9

A minor 9th, Open

Bass
A, the root
Root
A
Strings
A D G B e · open
  • ARoot
  • Cm3
  • EP5
  • Gm7
  • B9

Up the neck

6 voicings, same five notes

Why a minor 9th chord sounds the way it does

A+3 fretsC+4 fretsE+3 fretsG+4 fretsB

Stacked from 4 intervals.

04

Where to go next

More A chords

Same root, other colours

Am7Am6AmM7Am11

Chords in the key of A minor

What Am9 usually sits next to

i · Amii° · B°III · Civ · Dmv · EmVI · FVII · G

Close relatives

Relatives of A minor

  • CRelative major of A minor
  • AParallel major, raise the 3rd

Other m9 chords

Same quality, every root

Cm9C♯m9Dm9E♭m9Em9Fm9F♯m9Gm9A♭m9Am9B♭m9Bm9
01

Root

A
02

Quality

m9

5+ notes: stack the 9th, 11th or 13th on a 7th chord.

Alterations need a 7th chord. Try A7 →

Why a minor 9th chord sounds the way it does

A+3 fretsC+4 fretsE+3 fretsG+4 fretsB

Stacked from 4 intervals.

03

How to play it

EADGBe241312345

Am9

A minor 9th, Open

Bass
A, the root
Root
A
Strings
A D G B e · open
  • ARoot
  • Cm3
  • EP5
  • Gm7
  • B9

Up the neck

6 voicings, same five notes
04

Where to go next

More A chords

Same root, other colours

Am7Am6AmM7Am11

Chords in the key of A minor

What Am9 usually sits next to

i · Amii° · B°III · Civ · Dmv · EmVI · FVII · G

Close relatives

Relatives of A minor

  • CRelative major of A minor
  • AParallel major, raise the 3rd

Other m9 chords

Same quality, every root

Cm9C♯m9Dm9E♭m9Em9Fm9F♯m9Gm9A♭m9Am9B♭m9Bm9
A minor 9th