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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. C
  4. /
  5. 7

C dominant 7th (C7)

CRoot
EMaj 3
GPerf 5
B♭min 7

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

Notes
CEGB♭
Formula
1 · 3 · 5 · ♭7
Type
Seventh chord
03

How to play it

EADGBe324112345

C7

C dominant 7th, Open

Bass
C, the root
Root
C
Strings
A D G B e · open
  • CRoot
  • EM3
  • GP5
  • B♭m7

Up the neck

6 voicings, same four notes

Why a dominant 7th chord sounds the way it does

C+4 fretsE+3 fretsG+3 fretsB♭

Stacked from 3 intervals. Compare with Cmaj7 →

04

Where to go next

More C chords

Same root, other colours

C9C13Csus4Cmaj7

Chords in the key of C

What C7 usually sits next to

I · Cii · Dmiii · EmIV · FV · Gvi · Amvii° · B°

Close relatives

Relatives of C major

  • AmRelative minor of C major
  • CmParallel minor, lower the 3rd

Other 7 chords

Same quality, every root

C7C♯7D7E♭7E7F7F♯7G7A♭7A7B♭7B7
01

Root

C
02

Quality

7

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

Why a dominant 7th chord sounds the way it does

C+4 fretsE+3 fretsG+3 fretsB♭

Stacked from 3 intervals. Compare with Cmaj7 →

03

How to play it

EADGBe324112345

C7

C dominant 7th, Open

Bass
C, the root
Root
C
Strings
A D G B e · open
  • CRoot
  • EM3
  • GP5
  • B♭m7

Up the neck

6 voicings, same four notes
04

Where to go next

More C chords

Same root, other colours

C9C13Csus4Cmaj7

Chords in the key of C

What C7 usually sits next to

I · Cii · Dmiii · EmIV · FV · Gvi · Amvii° · B°

Close relatives

Relatives of C major

  • AmRelative minor of C major
  • CmParallel minor, lower the 3rd

Other 7 chords

Same quality, every root

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