CadenzaF♯ seventh, sharp nine
F♯7(♯9)
Also written G♭7(♯9) · F♯7+9 · F#7#9
G𝄪 is the key you know as A.
Major 3rd and minor 3rd at once: the ♯9 (G𝄪) is the minor 3rd written as a tension. The “Hendrix chord”, the blues' favourite dominant, and in jazz a V of B minor.
How pianists voice F♯7(♯9)
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.
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.
Hendrix voicing Guitar shape
1 · 3 · ♭7 · ♯9 — root low, then 3rd, ♭7 and the ♯9 on top, so major and minor 3rd ring together. Jimi Hendrix made it famous on E.
Seventh, sharp nine chords in every key
Every F♯ chord
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.