Guitar Chord C#maj9: Structure, Notes and Theory

C#maj9 — a chord built on the note “C#” with an airy, soft sound and a subtle shimmer in the upper register. Brings spaciousness and elegance to jazz and soul. Creates a sense of smoothness and harmonic width.

Formula and Structure of the C#maj9 Chord

Interval formula from the root note: 1 — 3 — 5 — 7 — 9. The chord consists of the following notes:

• Db — unison and the main tonal anchor.
• F — major third with a bright major quality and clear stability above the tonic.
• Ab — perfect fifth, stabilizing the triad and adding tonal grounding.
• C — major seventh with a smooth jazz sparkle and slight tension toward the octave.
• Eb — major ninth, opening the top line and adding airiness to the texture.

Together, these notes form the harmonic foundation of the C#maj9 chord, defining its sound and role in the musical context.

Alternative Names for the C#maj9 Chord

This chord may appear under different names:

• C#Δ9

All variants refer to the same harmonic structure.

Using the C#maj9 Chord

Place the 9 in the top voice for light airiness. Avoid crowding with the 3 in the lower registers. Use for intros, codas, and transparent accompaniments. On guitar, the 9 can be held as a pedal tone, creating a soft backdrop over changing bass notes.

Conclusion

C#maj9 is an expressive and versatile chord. Learn several fingerings, experiment with different positions and voice spacing, then try weaving it into your own playing — this will help you quickly find your unique tone.