The half-diminished (m7♭5) chord — 1–♭3–♭5–♭7. It is the ii chord of a minor key and the classic setup for a minor ii–V–i in jazz.
NotesE · G · A♯ · D
Formula1 · ♭3 · ♭5 · ♭7
Every half-diminished chord tone across the neck. Solo with these and you spell the chord — that's the difference between running a scale and playing the changes.
