Cadd9 chord
C added ninth
<
1 / 1
>
3
5
7
10
The Cadd9 chord has the formula 1, 3, 5, 9 with notes C, E, G, D
The added ninth chord can be built by taking a major chord and adding the 9th of the scale. It serves a similar purpose to the major chord, with the additional extension for color or harmonizing with other instruments.