C seven sharp nine
C7#9 Piano Voicings
C7#9 is an altered dominant famous from rock and bebop alike. The clash between the major third and the sharp ninth gives it a gritty, bluesy tension.
Drill C7#9 in all 12 keysThe notes in C7#9
- C R
- E 3
- G 5
- Bb ♭7
- Eb ♯9
C7#9 voicings on piano
Each voicing is the exact shape the trainer drills. Press play to hear it — as a block chord or rolled note by note.
Root Position
C · E · G · Bb · Eb R · 3 · 5 · ♭7 · ♯9
Shell Voicing
C · E · Bb R · 3 · ♭7
Rootless A
E · G · Bb · Eb 3 · 5 · ♭7 · ♯9
Rootless B
Bb · Eb · E · G ♭7 · ♯9 · 3 · 5
Where C7#9 fits in a ii-V-I
C7#9 is an altered dominant famous from rock and bebop alike. The clash between the major third and the sharp ninth gives it a gritty, bluesy tension.
The fastest way to internalise C7#9 is to drill it in context across all 12 keys until the shape is automatic.
Practice the full ii-V-I progressionC7#9 — frequently asked questions
What notes are in C7#9?
C7#9 contains C, E, G, B♭ and D♯ — root, third, fifth, flat seventh and sharp ninth.
Why is C7#9 called the Hendrix chord?
Jimi Hendrix made the dominant 7#9 voicing iconic in rock; the sharp ninth grinding against the major third gives it its signature bite.