The major seventh chord, commonly noted as "maj7," comprises a root note, a major third, a perfect fifth, and a major seventh. This chord quality produces a rich and full sound, often associated with jazz, pop, and smooth ballads. It adds a touch of elegance and sophistication to progressions. When played on the guitar, the sound is warm and uplifting, creating a sense of resolution and completeness. To build a Cmaj7 chord, for example, you would use the notes C, E, G, and B. Guitarists often use this chord to enhance harmonic depth and texture in their music.