C 9th chord

C9 chord (also called Dominant 9th chord) for piano presented by keyboard diagrams.
Explanation: The C ninth is a five-note chord. Due to practical circumstances, however, the fifth (G) is often omitted and/or the chord is played inverted. The chord is often abbreviated as C9.
Omissions: C9(no3): C - G - Bb - D; C9(no5): C - E - Bb - D.
Theory: The C ninth chord is constructed with a root, a major third, a perfect fifth, a minor seventh and a major ninth.


C9 chord diagram
Notes: C - E - G - Bb - D

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C9 inverted

C9 chord diagram
One of many possible inversions (C9/Bb)

C9 chord diagram
Notes: (left hand) C - G (right hand) Bb - D - E
Two-hand voicing

C chord categories

C Cm C7 Cm7 Cmaj7 CmM7 C6 Cm6 C6/9 C5 C9 Cm9 Cmaj9 C11 Cm11 Cmaj11 C13 Cm13 Cmaj13 Cadd C7-5 C7+5 Csus Cdim Cdim7 Cm7b5 Caug Caug7