CadenzaF half-diminished seventh
Fø7
Also written Fø · Fm7(♭5) · F−7♭5 · Fm7b5
C♭ is the key you know as B.
The ii chord of a minor key: Fø7 → B♭7(♭9) → E♭m is the minor ii–V–i in E♭ minor. It is also the vii chord of G♭ major, and it has the same notes as A♭m6.
How pianists voice Fø7
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
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
♭3 · ♭5 · ♭7 · 9 — no root: the bass player has it. The left-hand voicing of modern jazz piano. Without F underneath, the same keys read as A♭m(maj7) — the bass turns them into Fø7.
Rootless B From the 7th
♭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
♭5 · 1 · ♭3 · ♭7 — close position with the second voice from the top dropped an octave: wider, warmer, the standard for chord melody.
Fø7 inversions
The same 4 notes with a different one in the bass. Each inversion is written as a slash chord.
Root position Fø7
Root at the bottom, stacked in 3rds: 1 · ♭3 · ♭5 · ♭7.
1st inversion Fø7/A♭
A♭ (the ♭3) in the bass: ♭3 · ♭5 · ♭7 · 1.
2nd inversion Fø7/C♭
C♭ (the ♭5) in the bass: ♭5 · ♭7 · 1 · ♭3.
3rd inversion Fø7/E♭
E♭ (the ♭7) in the bass: ♭7 · 1 · ♭3 · ♭5.
Half-diminished seventh chords in every key
Every F chord
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