The C major 9 chord is a musical chord that consists of five notes: C, E, G, B, and D. It is built from the C major scale and includes the root note (C), the major third (E), the perfect fifth (G), the major seventh (B), and the ninth (D). This chord is often used in various music genres, including jazz and pop, to create a rich and colorful sound. In terms of notation, the C major 9 chord is typically written as Cmaj9 or CM9. Musicians can play this chord on various instruments, such as the piano or guitar, to add depth and complexity to their compositions. The inclusion of the ninth note gives the chord a more extended and sophisticated quality compared to a standard major chord.