The C-flat dominant ninth chord (abbreviated "Cb9 chord") is a five-note chord consisting of the notes C, E, G, B, and D. The chord is formed by adding a major ninth to a C-flat dominant seventh chord.

In practice, the fifth (G) is sometimes omitted from the Cb9 chord because it's not always possible to play all notes simultaneously.

Name
C-flat dominant ninth chord
Notes
C E G B D
Intervals
1 3 5 7 9
Chord symbol
C9
Type
Pentad (five-note chord)

Cb9 chord on piano

Cb9 chord on guitar

Cb9 chord on ukulele

Cb9 chord on the staff