Minor 13th ♭5 Chords on Piano

The minor 13th ♭5 chord is the fullest extension of the half-diminished family — adding the 9th, 11th, and 13th to a m7♭5 foundation. The natural 13th (major 6th) adds a surprising warmth to the otherwise dark chord, making it a favorite ending chord in modal jazz and as a rich ii voicing in minor-key ballads.

Formula: Root – Minor 3rd – Diminished 5th – Minor 7th – Major 9th – Perfect 11th – Major 13th

Scale degrees: 1–♭3–♭5–♭7–9–11–13

Sound: Rich, warm-dark, modal jazz, ballad

Symbol: m13♭5 (Cm13♭5)