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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. 7

A dominant 7th (A7)

ARoot
C♯Maj 3
EPerf 5
Gmin 7

Bluesy and driving. The backbone of blues and jazz. Creates strong tension that resolves to the tonic (V7→I progression).

Notes
AC♯EG
Formula
1 · 3 · 5 · ♭7
Type
Seventh chord
03

How to play it

EADGBe2312345

A7

A dominant 7th, Open

Bass
A, the root
Root
A
Strings
A D G B e · open
  • ARoot
  • C♯M3
  • EP5
  • Gm7

Up the neck

6 voicings, same four notes

Why a dominant 7th chord sounds the way it does

A+4 fretsC♯+3 fretsE+3 fretsG

Stacked from 3 intervals. Compare with Amaj7 →

04

Where to go next

More A chords

Same root, other colours

A9A13Asus4Amaj7

Chords in the key of A

What A7 usually sits next to

I · Aii · Bmiii · C♯mIV · DV · Evi · F♯mvii° · G♯°

Close relatives

Relatives of A major

  • F♯mRelative minor of A major
  • AmParallel minor, lower the 3rd

Other 7 chords

Same quality, every root

C7C♯7D7E♭7E7F7F♯7G7A♭7A7B♭7B7
01

Root

A
02

Quality

7

4 notes: a triad plus a 7th. Jazzier, wants to move.

Why a dominant 7th chord sounds the way it does

A+4 fretsC♯+3 fretsE+3 fretsG

Stacked from 3 intervals. Compare with Amaj7 →

03

How to play it

EADGBe2312345

A7

A dominant 7th, Open

Bass
A, the root
Root
A
Strings
A D G B e · open
  • ARoot
  • C♯M3
  • EP5
  • Gm7

Up the neck

6 voicings, same four notes
04

Where to go next

More A chords

Same root, other colours

A9A13Asus4Amaj7

Chords in the key of A

What A7 usually sits next to

I · Aii · Bmiii · C♯mIV · DV · Evi · F♯mvii° · G♯°

Close relatives

Relatives of A major

  • F♯mRelative minor of A major
  • AmParallel minor, lower the 3rd

Other 7 chords

Same quality, every root

C7C♯7D7E♭7E7F7F♯7G7A♭7A7B♭7B7
A dominant 7th