Bass · ninth
C9 Chord on Bass
C Dominant 9th is C, E, G, Bb, D — the 1-3-5-b7-9 pattern of a ninth chord. Here is the shape, the audio, and what usually goes wrong.
There is no open C9 on bass. The one shape below sits up the neck and is rated advanced.
Start here — Movable 9th Shape (7th fret)
Sits at fret 7 — tighter and brighter than the low shapes, and high enough to keep out of the way of anyone playing the open version underneath.
What beginners get wrong
Moving in and out of it
The shape above: Movable 9th Shape (7th fret).
Listening: each shape above has its own play button, and each one plays the notes that shape actually produces — not a generic triad.
C9 on other instruments
Same notes, different hands. Every link below is a real page with diagrams and audio.
Chords next door
Same root, different colour — and all of them playable on bass.
C9 on Bass — questions people ask
What is the easiest way to play C9 on bass?
“Movable 9th Shape (7th fret)” — which we rate advanced — is the easiest C9 shape on bass. Sits at fret 7 — tighter and brighter than the low shapes, and high enough to keep out of the way of anyone playing the open version underneath. There is no open C9 on bass, so a barre is unavoidable; this is the least demanding one.
What notes are in the C Dominant 9th chord?
C Dominant 9th is C, E, G, Bb, D — the 1-3-5-b7-9 interval pattern of a ninth chord. Every voicing on this page uses those notes and nothing else; they just appear in a different order and octave.
What can I play instead of C9?
The nearest stand-ins on bass that keep the same root are Csus4, Csus2, C. They keep the root and the fifth and only change what sits in the middle, so most songs still work — but check the swap against the melody, because the note you removed may be the one the tune is singing.
Can I play C9 on other instruments?
Yes. C9 is the same set of notes everywhere; only the fingering changes. This site has diagrams and audio for it on guitar, piano, ukulele, mandolin, banjo.
Learn the theory behind C9
The shape gets your fingers there. These explain why it sounds the way it does.