CadenzaB♭ major ninth, sharp eleven
B♭maj9(♯11)
Also written A♯maj9(♯11) · B♭Δ9(♯11) · Bbmaj9#11
Lydian with the 9th: 1–3–5–7–9–♯11. Without its root the chord is Dm9.
How pianists voice B♭maj9(♯11)
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 B♭ underneath, the same keys read as Dm7 — the bass turns them into B♭maj9(♯11).
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.
Major ninth, sharp eleven chords in every key
Every B♭ chord
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