Guitar Chord C#6/9: Structure, Notes and Theory

C#6/9 — a chord built on the note “C#” with an open, clean, and light sound. Often used in lounge, bossa nova, and acoustic arrangements.

Formula and Structure of the C#6/9 Chord

Interval formula from the root note: 1 — 3 — 5 — 6 — 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.
• Bb — major sixth with a warm upper hue, pairing with the 9 to form a soft 6/9 tonic.
• Eb — major ninth, opening the top line and adding airiness to the texture.

Together, these notes form the harmonic foundation of the C#6/9 chord, defining its sound and role in the musical context.

Alternative Names for the C#6/9 Chord

This chord may appear under different names:

• C#6-9
• C#69

All variants refer to the same harmonic structure.

Using the C#6/9 Chord

Keep the 6 and 9 in the top voice to keep the chord light and open. Avoid excessive density in the bass. Works perfectly in bossa nova and lounge as a soft tonic.

Conclusion

C#6/9 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.