Chord reference · five-note chord
C6/9 chord (C major sixth/ninth)
For a quick answer, the notes in C6/9 are C, E, G, A, D. The diagrams below show the same pitch set on piano and guitar.
C6/9 chord notes and interval formula
The formula 1–3–5–6–9 means the chord is measured from C using the root, major third, perfect fifth, major sixth, and major ninth. In semitone numbers from the root, the pattern is 0–4–7–9–14. On a real instrument, it is normal to omit a less important tone—usually the fifth—when the full closed position is too dense.
| Degree | Interval | Semitones | Note |
|---|---|---|---|
| 1 | Root | 0 | C |
| 3 | Major Third | 4 | E |
| 5 | Perfect Fifth | 7 | G |
| 6 | Major Sixth | 9 | A |
| 9 | Major Ninth | 14 | D |
How to play C6/9 on piano
Start with the notes in root position from low to high: C – E – G – A – D. Use 1–2–3–4–5 or split the voicing between both hands is a useful starting point, but black-key combinations and melodic movement may make another fingering more comfortable.
For a cleaner accompaniment, place the root in the left hand and play the remaining tones in the right. With extended chords, keep the third and seventh because they identify the chord quality most clearly.
How to play C6/9 on guitar
Try the shape x-3-0-0-5-5 in standard tuning, read from low E to high E. The sounding-string details are: E mute; A fret 3: C; D open: D; G open: G; B fret 5: E; E fret 5: A. Keep every note clear and release pressure from strings marked “x.”
This is one voicing, not the only correct shape. The chord remains C6/9 whenever the essential pitch classes are present; doubling, omission, and bass-note choice change the voicing rather than the basic chord name.
C6/9 inversions and slash chords
Inversions keep the same notes but place a different chord tone in the bass. They are useful for smoother bass lines, compact keyboard movement, and alternative guitar voicings.
| Position | Symbol | Notes low to high | Bass |
|---|---|---|---|
| Root position | C6/9 | C – E – G – A – D | C |
| 1st inversion | C6/9/E | E – G – A – D – C | E |
| 2nd inversion | C6/9/G | G – A – D – C – E | G |
| 3rd inversion | C6/9/A | A – D – C – E – G | A |
What C6/9 sounds like and where it fits
The C major sixth/ninth chord is open, polished, and consonant. Sixth/ninth chords are spacious tonic voicings. The sixth and ninth add color without the strong pull of a major seventh, making the chord common in jazz, soul, funk, and polished pop harmony.
C6/9 compared with similar chords
Small interval changes create different chord names. Use this table to avoid confusing C6/9 with nearby structures.
| Chord | Quality | Formula | Notes |
|---|---|---|---|
| C6 | Major Sixth | 1–3–5–6 | C, E, G, A |
| Cadd9 | Added Ninth | 1–3–5–9 | C, E, G, D |
| Cmaj7 | Major Seventh | 1–3–5–7 | C, E, G, B |
Frequently asked questions
What notes are in the C6/9 chord?
The C6/9 chord contains C, E, G, A, D. Its interval formula is 1–3–5–6–9.
How do you play C6/9 on piano?
Play C, E, G, A, D together. A practical root-position fingering is use 1–2–3–4–5 or split the voicing between both hands; adjust the fingering to your hand and musical context.
How do you play C6/9 on guitar?
One compact standard-tuning shape is x-3-0-0-5-5 from the low E string to the high E string. An “x” means mute that string.
What does the symbol C6/9 mean?
The root is C. The suffix 6/9 identifies a major sixth/ninth structure with the formula 1–3–5–6–9.
How many inversions does C6/9 have?
A 5-note chord has 5 closed-position arrangements when every chord tone is retained: root position plus 4 inversions. Extended practical voicings may omit notes.