Cb9 chord
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
C♭9
Type
Pentad (five-note chord)