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

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  1. Chords
  2. /
  3. C
  4. /
  5. 9

C 9th (C9)

CRoot
EMaj 3
GPerf 5
B♭min 7
D9

Rich and bluesy. Dominant 7 with added 9th. Common in jazz, blues, and R&B for sophisticated harmony.

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

How to play it

EADGBe1233fr4567

C9

C 9th, 1fr

Bass
C, the root
Root
C
Strings
A D G B e · open
  • CRoot
  • EM3
  • GP5
  • B♭m7
  • D9

Up the neck

6 voicings, same five notes

Why a 9th chord sounds the way it does

C+4 fretsE+3 fretsG+3 fretsB♭+4 fretsD

Stacked from 4 intervals.

04

Where to go next

More C chords

Same root, other colours

Cmaj7C7Cadd9C6Csus2Csus4Cmaj9C6/9

Chords in the key of C

What C9 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 9 chords

Same quality, every root

C9C♯9D9E♭9E9F9F♯9G9A♭9A9B♭9B9
01

Root

C
02

Quality

9

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

Why a 9th chord sounds the way it does

C+4 fretsE+3 fretsG+3 fretsB♭+4 fretsD

Stacked from 4 intervals.

03

How to play it

EADGBe123345673fr

C9

C 9th, 1fr

Bass
C, the root
Root
C
Strings
A D G B e · open
  • CRoot
  • EM3
  • GP5
  • B♭m7
  • D9

Up the neck

6 voicings, same five notes
04

Where to go next

More C chords

Same root, other colours

Cmaj7C7Cadd9C6Csus2Csus4Cmaj9C6/9

Chords in the key of C

What C9 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 9 chords

Same quality, every root

C9C♯9D9E♭9E9F9F♯9G9A♭9A9B♭9B9
C 9th