Quick Answer & Harmonic Definition

To play the C Add9 chord on piano, press the keys C, E, G, D simultaneously. In root position, C is the lowest note. First inversion places E in the bass; second inversion uses G as the lowest note.

Piano Chord

Cadd9 Piano Chord

Major triad with an added 9th (no 7th). Lush, open sound popular in pop. Learn the C Add9 chord on piano with interactive keyboard, inversions, and audio playback.

Notes
C – E – G – D
Intervals
0 – 4 – 7 – 14
Type
seventh chord
C E G D
E
A
D
G
B
e
3
5
7
9
12
4 notes · Standard (E A D G B E)

Playing the Cadd9 Piano Chord

The Cadd9 chord is a add9 chord built on the root C. It contains 4 notes: C, E, G, D. On piano, this chord is played by pressing these keys simultaneously or as an arpeggio.

Major triad with an added 9th (no 7th). Lush, open sound popular in pop. Mastering the Cadd9 chord opens up countless songs and progressions in the key of C.

Piano Finger Positions for Cadd9

For the Cadd9 seventh chord, use these finger positions:

  • Right hand (root position): Thumb (1) on C, middle finger (3) on E, pinky (5) on G.
  • Left hand (root position): Pinky (5) on C, middle finger (3) on E, thumb (1) on G.
  • Arpeggiated: Play the notes sequentially from lowest to highest for a broken seventh effect.

Cadd9 Chord Inversions

Inversions change the bass note while keeping the same harmonic quality:

Inversion Bass Note Notes (bottom to top) Sound
Root C C – E – G – D Most stable
1st E E – G – D – C Lighter, less stable
2nd G G – D – C – E Open, airy

Interval Structure of Cadd9

Degree Interval Semitones Note in C
Root Root (R) 0 C
3rd Major 3rd 4 E
5th Perfect 5th 7 G
7th Major 9th 14 D

Common Progressions with Cadd9 on Piano

  • I–IV–V–I: Cadd9 – Fadd9 – Gadd9 – Cadd9 (classic cadence)
  • I–V–vi–IV: Cadd9 – G – Am – F (pop progression)
  • ii–V–I: Dm – G – Cadd9 (jazz turnaround)

Other C Piano Chords

C
Major
Cm
Minor
C7
Dominant 7th
Cmaj7
Major 7th
Cm7
Minor 7th
Cdim
Diminished

Add9 Chord in All 12 Keys

Cadd9 C#add9 Dadd9 D#add9 Eadd9 Fadd9 F#add9 Gadd9 G#add9 Aadd9 A#add9 Badd9
Virtual Piano
Interactive keyboard
Cadd9 Guitar
Guitar chord shapes
C Scale
Notes that fit this chord
Songs
Find songs using Cadd9

Knowledge Base & FAQs

Cadd9 Piano Chord — FAQ

Everything you need to know about our browser-based Web Audio engine, instruments, and music theory workspace.

How do I play the Cadd9 chord on piano?

To play the C Add9 chord on piano, press the keys C, E, G, D simultaneously.

In root position, C is the lowest note. First inversion places E in the bass; second inversion uses G as the lowest note.

What are the notes in the Cadd9 piano chord?

The C Add9 piano chord contains 4 notes: C, E, G, D.

These are derived from the add9 interval formula applied to the root note C.

What is the best fingering for Cadd9 on piano?

For the Cadd9 seventh in root position, use fingers 1 (thumb), 3, and 5 for a triad, or 1, 2, 3, and 5 for a seventh chord.

Inversions may use 1, 2, 4 (first inversion) or 1, 3, 5 (second inversion).

What does the Cadd9 chord sound like?

The Cadd9 chord has a major triad with an added 9th (no 7th).

lush, open sound popular in pop. It provides rich harmonic tension and expressive color within songwriting and jazz arrangements.

What keys does the Cadd9 chord belong to?

Cadd9 appears frequently across modal, jazz, blues, and contemporary progressions as an essential tension or resolution voicing.

What are the inversions of Cadd9 on piano?

Cadd9 has 3 inversions.

Root position: C–E–G–D. First inversion: E–G–D–C. Second inversion: G–D–C–E.

What chords go well with Cadd9 on piano?

In the key of C major, Cadd9 pairs naturally with F major (IV chord), G major (V chord), and Am (vi chord).

The I–IV–V–I progression is a classic way to practice these.

Is Cadd9 a good chord for beginners on piano?

Cadd9 has 4 notes, which may be challenging for beginners.

Start with the basic triad (root, third, fifth) before adding the full seventh extension.

How do I use Cadd9 in a chord progression?

Cadd9 functions as the tonic (I) in C major.

A classic progression is I–IV–V–I: Cadd9–F–G–Cadd9. Practice this in both hands separately before combining.

What is the difference between C major and C minor on piano?

The C major chord (C–E–G) uses a major third (4 semitones from root) for a bright sound.

The Cm chord uses a minor third (3 semitones) for a darker, more emotional sound.