G half-diminished seventh

Gø7

Also written · Gm7(♭5) · G−7♭5 · Gm7b5

NotesG · B♭ · D♭ · F
Formula1 · ♭3 · ♭5 · ♭7
G1F♭7B♭♭3D♭♭5
Root position

The ii chord of a minor key: Gø7 → C7(♭9)Fm is the minor ii–V–i in F minor. It is also the vii chord of A♭ major, and it has the same notes as B♭m6.

How pianists voice Gø7

Nobody plays a jazz chord in root position. These are the shapes that actually get played — the same ones Cadenza shows when you play the chord.

Shell Left hand

G1F♭7B♭♭3

1 · ♭3 · ♭7 — root, 3rd and 7th: the three notes that say what the chord is. Left hand, low; everything else is colour.

Rootless A From the 3rd

F♭7A9B♭♭3D♭♭5

♭3 · ♭5 · ♭7 · 9 — no root: the bass player has it. The left-hand voicing of modern jazz piano. Without G underneath, the same keys read as B♭m(maj7) — the bass turns them into Gø7.

Rootless B From the 7th

F♭7A9B♭♭3D♭♭5

♭7 · 9 · ♭3 · ♭5 — the other half of the pair. A and B alternate through a ii–V–I so the hand barely moves.

Drop 2 Two hands

G1F♭7D♭♭5B♭♭3

♭5 · 1 · ♭3 · ♭7 — close position with the second voice from the top dropped an octave: wider, warmer, the standard for chord melody.

Gø7 inversions

The same 4 notes with a different one in the bass. Each inversion is written as a slash chord.

Root position Gø7

G1F♭7B♭♭3D♭♭5

Root at the bottom, stacked in 3rds: 1 · ♭3 · ♭5 · ♭7.

1st inversion Gø7/B♭

F♭7G1B♭♭3D♭♭5

B♭ (the ♭3) in the bass: ♭3 · ♭5 · ♭7 · 1.

2nd inversion Gø7/D♭

F♭7G1D♭♭5B♭♭3

D♭ (the ♭5) in the bass: ♭5 · ♭7 · 1 · ♭3.

3rd inversion Gø7/F

F♭7G1B♭♭3D♭♭5

F (the ♭7) in the bass: ♭7 · 1 · ♭3 · ♭5.

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