The C-flat half-diminished seventh chord (abbreviated "Cbm7(b5) chord") is a four-note chord consisting of the notes C♭, E♭♭, G♭♭, and B♭♭. The chord is formed by lowering the fifth of a C-flat minor seventh chord a half step.
C-flat half-diminished seventh chord
C-flat half-diminished chord C-flat minor seventh flat five chord
C♭ E♭♭ G♭♭ B♭♭
1 ♭3 ♭5 ♭7
C♭ø C♭ø7 C♭m7b5 C♭–7(b5) C♭mi7(b5) C♭min7(b5)
tetrad (four-note chord)