CadenzaF thirteenth, sharp eleven
F13(♯11)
Also written F13#11
Everything the lydian dominant has: 9, ♯11 and 13. Those three tensions form a G major triad — “upper structure II” — so pianists play it as G over F7.
How pianists voice F13(♯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 · 13 · ♭7 · 9 — no root: the bass player has it. The left-hand voicing of modern jazz piano.
Rootless B From the 7th
♭7 · 9 · 3 · 13 — the other half of the pair. A and B alternate through a ii–V–I so the hand barely moves. Without F underneath, the same keys read as E♭maj7(♯11) — the bass turns them into F13(♯11).
Drop 2 Two hands
13 · 1 · 3 · ♭7 — close position with the second voice from the top dropped an octave: wider, warmer, the standard for chord melody.
Upper structure II Triad over shell
1 · 3 · ♭7 · 9 · ♯11 · 13 — a G major triad in the right hand (9, ♯11 and 13) over the root, 3rd and ♭7 in the left. One familiar shape, all the tension.
Play a chord. See its name.
The free chord finder names whatever you play — on a MIDI keyboard, with your mouse or on your computer keys — with the same engine as Cadenza.
Or let the app follow you.
Cadenza names every chord you play, live, writes what you played as sheet music, and puts the keyboard straight into OBS. The core is free forever.