Guitar Chord Cadd9: Structure, Notes and Theory

Cadd9 — a chord built on the note “C” with a clear, stable, and versatile tone. Easily expanded with extensions for extra brightness and color. The chord includes added tones: add9 — a spacious, melodic color, especially striking when the top note acts as a leading tone.

Formula and Structure of the Cadd9 Chord

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

• C — unison and the main tonal anchor.
• E — major third with a bright major quality and clear stability above the tonic.
• G — perfect fifth, stabilizing the triad and adding tonal grounding.
• D — major ninth, opening the top line and adding airiness to the texture.

Together, these notes form the harmonic foundation of the Cadd9 chord, defining its sound and role in the musical context.

Alternative Names for the Cadd9 Chord

This chord may appear under different names:

• Cmajadd9
• Cmaadd9
• Cmajoradd9

All variants refer to the same harmonic structure.

Using the Cadd9 Chord

Keep the 1, 3, and 5 clear and stable to form the base. Place color tones in the top voices. Works well with gradual addition of extensions.

Conclusion

Cadd9 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.