Guitar · seventh sharp nine
C7♯9 Chord on Guitar
C Dominant 7♯9 (Hendrix) is C, E, G, Bb, D# — the 1-3-5-b7-#9 pattern of a seventh sharp nine chord. Here is the shape, the audio, and what usually goes wrong.
There is no open C7#9 on guitar — the single shape below is a barre, which is exactly why this chord trips people up. Take it slowly and check every string.
Start here — E Shape Barre (Hendrix) (8th fret)
Barre at fret 8 — the same movable idea, further up the neck: brighter, more compact, and easier to reach if you are already playing up there.
What beginners get wrong
Moving in and out of it
The shape above: E Shape Barre (Hendrix) (8th fret) — barred at fret 8.
Listening: each shape above has its own play button, and each one plays the notes that shape actually produces — not a generic triad.
C7#9 on other instruments
Same notes, different hands. Every link below is a real page with diagrams and audio.
Or see C Dominant 7♯9 (Hendrix) on every instrument at once.
Chords next door
Same root, different colour — and all of them playable on guitar.
C7#9 on Guitar — questions people ask
What is the easiest way to play C7#9 on guitar?
“E Shape Barre (Hendrix) (8th fret)” — which we rate advanced — is the easiest C7#9 shape on guitar. Barre at fret 8 — the same movable idea, further up the neck: brighter, more compact, and easier to reach if you are already playing up there. There is no open C7#9 on guitar, so a barre is unavoidable; this is the least demanding one.
What notes are in the C Dominant 7♯9 (Hendrix) chord?
C Dominant 7♯9 (Hendrix) is C, E, G, Bb, D# — the 1-3-5-b7-#9 interval pattern of a seventh sharp nine chord. Every voicing on this page uses those notes and nothing else; they just appear in a different order and octave.
What can I play instead of C7#9?
The nearest stand-ins on guitar that keep the same root are Csus4, Csus2, C. They keep the root and the fifth and only change what sits in the middle, so most songs still work — but check the swap against the melody, because the note you removed may be the one the tune is singing.
Can I play C7#9 on other instruments?
Yes. C7#9 is the same set of notes everywhere; only the fingering changes. This site has diagrams and audio for it on piano.
Learn the theory behind C7#9
The shape gets your fingers there. These explain why it sounds the way it does.
Barre Chords — The Wall Every Guitarist Climbs
This one asks for a barre. The article is the fix for the buzzing and the aching hand.
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Functional Harmony: Three Roles, One Engine
What a seventh chord is for — tension, resolution, and the seat it takes in the key.
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The 12-Bar Blues — Three Chords, A Century of Hits
Seventh chords are the whole sound of the blues. Twelve bars is where to hear it.
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