Cadd9 Chord on Ukulele
Cadd9 = C – E – G – D (Root, Major 3rd, Perfect 5th, Major 9th)
Cadd9 keeps the G and E strings open — including the E string that carries the chord's major third, unlike either suspended version — while the middle finger takes the C string's second fret and the ring finger closes out the shape on the A string, three frets up. Because the third stays intact and open, this shape sounds fuller and more clearly major than either sus chord, even though it also introduces a new color tone.
An add9 chord keeps the full major triad exactly as is and adds the ninth (the second scale degree, an octave up) on top, rather than replacing anything the way a sus chord does. That distinction matters: Cadd9 sounds unambiguously like a C major chord, just a richer, more layered one, where Csus2 sounds genuinely different in color because it has no third at all. This lush, slightly shimmering quality makes add9 chords popular in singer-songwriter and pop ukulele arrangements that want extra harmonic interest without sacrificing a clear major tonality. It can substitute for plain C major almost anywhere in a progression without changing the song's basic harmonic function, since every note of the plain triad is still present.
Fingerings
Open Position
How to Practice It
Because the fretted notes land on the C and A strings while the G and E strings ring open, this shape asks the middle and ring fingers to work independently on adjacent strings a fret apart — practice placing them together as a pair rather than one after the other. It's worth comparing Cadd9 directly against Csus2 by ear, since both add a second/ninth-related color tone, but Cadd9 keeps the third (via the open E string) while Csus2 removes it — hearing that difference sharpens a beginner's sense of what "suspended" actually means versus "added." Try substituting Cadd9 for plain C in a familiar progression to hear how it thickens the sound without changing the song's harmonic direction.
Common Progressions
- I(add9) in place of a plain I chord (Cadd9 – F – G – Cadd9)
- I(add9) – vi – IV – V (Cadd9 – Am – F – G)
- Cadd9 – G, a lush two-chord vamp under a simple melody
- IV – V – I(add9) (F – G – Cadd9), landing on the richer color instead of a plain triad
FAQ
- What's the difference between Cadd9 and Csus2?
- Cadd9 keeps the chord's major third intact and adds the ninth on top, sounding unambiguously major and fuller; Csus2 removes the third entirely and replaces it with the second, sounding genuinely ambiguous rather than simply richer.
- Can Cadd9 replace plain C major in a song?
- Yes, almost anywhere — since it contains every note of the plain triad plus one extra color tone, it doesn't change the song's harmonic function, just its texture.
- Why does Cadd9 sound "lush" compared to plain C?
- The added ninth sits a whole step above the octave, a color tone rather than a structural chord tone, which layers extra shimmer on top of the complete major triad without altering its core identity.
- What style of music uses add9 chords most on ukulele?
- Singer-songwriter and pop-leaning arrangements reach for add9 voicings often, wanting a richer, more textured version of a familiar major or minor chord without abandoning its basic harmonic role.
- Does Cadd9 need the middle and ring fingers to be placed in a specific order?
- Not strictly, but many players find it easiest to set the ring finger on the A string first as an anchor, then bring the middle finger down onto the C string beside it, since the ring finger's placement is slightly more exposed to the open A string's decay if it's not seated firmly.
- How does Cadd9 compare to C6 in terms of added color?
- Both add a single extra scale degree to the plain major triad — the ninth for add9, the sixth for C6 — but they land in very different places relative to the octave, giving add9 a brighter, higher shimmer and C6 a warmer, rounder lift.
- Which string carries the added ninth in this Cadd9 voicing?
- The C string, fretted at the second fret to produce D — the ninth, an octave above the second scale degree — while the E string stays open to preserve the chord's ordinary major third underneath it.
Cadd9 on other instruments: Cadd9 on Guitar, Cadd9 on Piano. Related: how chords are built, chord finder.