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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 F4 · 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 F4 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 Ab can usually be omitted from an extended chord, keeping the sound clear and the voicing manageable.

Notation for 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

Intervals and tones in C#7#9 chord

Note Interval
C# Root
F Major 3rd
Ab Perfect 5th
H Minor 7th
E Augmented 9th

More chords with C# as the root

The same chord type in other keys