The "Eleventh Chord" is a musical chord that consists of the root note, third, fifth, seventh, ninth, and eleventh degrees of a scale. It is often used in jazz and contemporary music to create a rich, complex sound. The eleventh note adds a unique color to the harmony, making it more interesting and layered. In music theory, the eleventh chord can be notated in various ways, such as C11 for a C major eleventh chord. Musicians often use it in improvisation and composition to evoke different emotions and textures. Understanding this chord can enhance a musician's ability to create diverse musical pieces.