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C#9#11 Piano Chord

A Lydian dominant chord — a bright, open sound. Typical of modern jazz.

Piano

Recommended voicing
Left hand C#3 · B3 fingers 5–1
Right hand F4 · G4 · Eb5 fingers 1–2–5

How to play the C#9#11 chord on piano

Split the recommended voicing between the hands: play C#3 and B3 with the left hand and F4, G4 and Eb5 with the right. Suggested fingering is 5–1 on the left and 1–2–5 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#9#11 chord

Other names: C# 9th sharp 11

Music theory name: ninth sharp eleven chord

Common name: C# 9#11 chord

Intervals and tones in C#9#11 chord

Note Interval
C# Root
F Major 3rd
Ab Perfect 5th
H Minor 7th
Eb Major 9th
G Augmented 11th

More chords with C# as the root

The same chord type in other keys