A D# Major Seventh Chord is a four-note chord that consists of the root note D#, the major third F## (which is enharmonically equivalent to G), the perfect fifth A#, and the major seventh C## (enharmonically equivalent to D). This chord is often used in various music genres to create a rich, jazzy sound. In music theory, the Major Seventh Chord is characterized by its unique combination of intervals, which gives it a distinct emotional quality. It can be notated as D#maj7 and is commonly found in compositions that require a more sophisticated harmonic structure, such as jazz and contemporary classical music.