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Minor 11th ♭5 Chords on Piano

The minor 11th ♭5 chord extends the half-diminished (m7♭5) chord with the 9th and 11th, creating a large, dark, and sophisticated voicing. It serves as an expanded ii chord in minor-key ii–V–i progressions and is the go-to voicing for jazz pianists who want a fuller half-diminished sound.

Formula: Root – Minor 3rd – Diminished 5th – Minor 7th – Major 9th – Perfect 11th
Scale degrees: 1–♭3–♭5–♭7–9–11
Sound: Dark, expansive, jazz, extended half-diminished
Symbol: m11♭5 (Cm11♭5)

The full ii chord in minor: In a Cm ii–V–i, the ii chord is Dm7♭5. Adding the 9th (E) and 11th (G) turns it into Dm11♭5 — a much richer voicing that fills more harmonic space. Drop the root for the pianist and you get a Bill Evans-style left-hand voicing.

Minor 11th ♭5 Chord in All 18 Keys