The Cadd9 chord is a popular guitar chord that adds a unique sound to music. It is formed by playing the notes C, E, G, and D. This chord is often used in various genres, including pop, rock, and folk, making it versatile for songwriters and musicians. To play Cadd9 on the guitar, you typically place your fingers on the second fret of the A string, the third fret of the B string, and the third fret of the high E string. This creates a rich, full sound that enhances many songs, making it a favorite among guitarists.