C add chords

C add chords for piano with keyboard diagram.
Explanation: The Cadd9 and Cadd2 are four note chords. Cadd2 is sometimes written as C2.
Theory: Both chords contain the same notes, but the added notes belong to different octaves which are the ninth and the second notes in the scale.

Cadd9

Cadd9 chord diagram
Notes: C - E - G - D

Cadd2

Cadd2 chord diagram
Notes: C - D - E - G

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C chord categories

C Cm C7 Cm7 Cmaj7 C6 Cm6 C6/9 C9 Cm9 Cmaj9 C11 C13 Cadd C7-5 C7+5 Csus Cdim Caug