C9 chord on piano
C9 is C, E, G, B♭ and D. C is the white key just left of the pair of black keys. Tap Play, then slow it down.
root position · C–E–G–B♭–D · right hand 1-2-3-4-5
- Notes
- C · E · G · B♭ · D
- Formula
- 1 · 3 · 5 · ♭7 · 9
How to play C9 on piano
From C, go 4 half steps up to E, 3 half steps up to G, 3 half steps up to B♭ then 4 half steps up to D. That's the whole chord: 5 keys.
- Right hand: 1 on C, 2 on E, 3 on G, 4 on B♭ and 5 on D.
- Left hand: 5 on C, 4 on E, 3 on G, 2 on B♭ and 1 on D.
- On the keyboard it's white, white, white, black and white keys, the same pattern as F9, so your hand shape carries over.
Two ways to voice C9
- root position: C–E–G–B♭–D. Right hand 1-2-3-4-5.
- close voicing: C–D–E–G–B♭. Right hand 1-2-3-4-5.
The close voicing folds the ninth down next to the root, which fits under one hand; the spread voicing sounds wider.
C9 chord changes
The chords C9 usually goes to, and what changes under your fingers.
- F (dominant, pulls to the chord a fifth below): C9 to F: play F in 2nd inversion (C–F–A) and C stays under the same finger, while E moves up to F and B♭ down to A. F on piano
- Fmaj7 (I in F major): C9 to Fmaj7: play Fmaj7 in 2nd inversion (C–E–F–A) and C and E stay under the same fingers, while G moves down to F and B♭ down to A. Fmaj7 on piano
- Dm7 (vi in F major): C9 to Dm7: play Dm7 in 1st inversion (F–A–C–D) and D stays under the same finger, while E moves up to F, B♭ down to A and B♭ up to C. Dm7 on piano
C9 is a dominant ninth: C7 with the ninth on top. C9 is the funk and soul version of C7, fuller on top and still pulling toward its resolution. On piano you hear it best with the keys pressed together, then rolled.
A short C9 drill
Roll the chord up and back down, C, E, G, B♭, D, B♭, G, E, C, before playing it as a block.
The keys of C9
C9 is a dominant ninth chord, 1–3–5–♭7–9 from C. Root position, from the bottom: how C9 is built.
| Note | Key | Fingers | Role |
|---|---|---|---|
| C | white key | RH 1 · LH 5 | root |
| E | white key | RH 2 · LH 4 | major third |
| G | white key | RH 3 · LH 3 | perfect fifth |
| B♭ | black key | RH 4 · LH 2 | minor seventh |
| D | white key | RH 5 · LH 1 | ninth |
C9 in context
C9 on guitar and ukulele
Switching instruments? Try C9 on ukulele or C9 on guitar, or compare them on the C9 chord page.
Next to try on piano
Other dominant ninth chords
C9 on piano: questions
What notes are in C9 on piano?
C, E, G, B♭ and D: C (white key), E (white key), G (white key), B♭ (black key) and D (white key). Right hand 1-2-3-4-5, left hand 5-4-3-2-1.
How do you play C9 on piano?
Press C, E, G, B♭ and D together (1 black, 4 white). Right hand: 1 on C, 2 on E, 3 on G, 4 on B♭ and 5 on D.
What are the inversions of C9?
C9 is usually played in root position (C–E–G–B♭–D) or as a close voicing (C–D–E–G–B♭).
What does C9 look like on the keyboard?
white, white, white, black and white keys, the same pattern as F9, so one hand shape covers all of them.
Checked automatically: no shape here plays a note outside C9. Updated September 2026.