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C7#9 Piano Chord

A raw, urgent sound containing both a major third and a minor third (augmented ninth = minor third). Made famous by Jimi Hendrix in "Purple Haze". A staple of blues-rock and funk.

Piano

Recommended voicing
Left hand C3 · Bb3 fingers 5–1
Right hand E4 · D#5 fingers 1–5

How to play the C7#9 chord on piano

Split the recommended voicing between the hands: play C3 and Bb3 with the left hand and E4 and D#5 with the right. Suggested fingering is 5–1 on the left and 1–5 on the right (1 is the thumb). The perfect fifth G can usually be omitted from an extended chord, keeping the sound clear and the voicing manageable.

Other names for the C7#9 chord

Other names: C 7th sharp 9, C Hendrix chord

Music theory name: seventh sharp nine chord

Common name: C Hendrix chord

Notes and intervals in the C7#9 chord

Note Interval
C Root
E Major 3rd
G Perfect 5th
Bb Minor 7th
D# Augmented 9th

More chords with C as the root

The same chord type in other keys

Songs using C7#9

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