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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
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  5. add9

C added 9th (Cadd9)

CRoot
EMaj 3
GPerf 5
D9

Modern and open. Major triad with added 9th, no 7th. Popular in pop, rock, and ambient music.

Notes
CEGD
Formula
1 · 3 · 5 · 9
Type
Added-tone chord
03

How to play it

EADGBe21312345

Cadd9

C added 9th, Open

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

Up the neck

6 voicings, same four notes

Why an added 9th chord sounds the way it does

C+4 fretsE+3 fretsG+7 fretsD

Stacked from 3 intervals.

04

Where to go next

More C chords

Same root, other colours

Cmaj7C7C6Csus2Csus4Cmaj9C6/9

Chords in the key of C

What Cadd9 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 add9 chords

Same quality, every root

Cadd9C♯add9Dadd9E♭add9Eadd9Fadd9F♯add9Gadd9A♭add9Aadd9B♭add9Badd9
01

Root

C
02

Quality

add9

A triad plus one colour note, no 7th. Softer than a 7th.

Alterations need a 7th chord. Try C7 →

Why an added 9th chord sounds the way it does

C+4 fretsE+3 fretsG+7 fretsD

Stacked from 3 intervals.

03

How to play it

EADGBe21312345

Cadd9

C added 9th, Open

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

Up the neck

6 voicings, same four notes
04

Where to go next

More C chords

Same root, other colours

Cmaj7C7C6Csus2Csus4Cmaj9C6/9

Chords in the key of C

What Cadd9 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 add9 chords

Same quality, every root

Cadd9C♯add9Dadd9E♭add9Eadd9Fadd9F♯add9Gadd9A♭add9Aadd9B♭add9Badd9
C added 9th