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C#7#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 C#3 · B3 fingers 5–1
Right hand E#4 · E5 fingers 1–5

How to play the C#7#9 chord on piano

Split the recommended voicing between the hands: play C#3 and B3 with the left hand and E#4 and E5 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 C#7#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 C#7#9 chord

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

More chords with C# as the root

The same chord type in other keys