C sixth/ninth chord

C6/9 chord for piano with keyboard diagram.
Explanation: The C sixth/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 abbreviated C6/9.
Theory: The C6/9 chord is constructed with a root, a major third, a perfect fifth, a major sixth and a major ninth.

C6/9

C6/9 piano chord
Notes: C - E - G - A - D

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C chord categories

C Cm C7 Cm7 Cmaj7 C6 Cm6 C6/9 C5 C9 Cm9 Cmaj9 C11 C13 Cadd C7-5 C7+5 Csus Cdim Caug