The Dominant Thirteenth Chord extends the Dominant Ninth Chord by adding a major thirteenth. The notes are: root, major third, perfect fifth, minor seventh, major ninth, and major thirteenth. The perfect eleventh (which is between the ninth and thirteenth) is almost universally omitted in this chord, as its presence would create a strong dissonance with the major third of the chord (a semitone distance), making the voicing 'muddy'. The sound of the Dominant 13 is lush, rich, and very 'jazzy', with a balance between the intrinsic tension of the dominant (given by the tritone between the third and seventh) and the openness and melody added by the ninth and thirteenth. It is a chord that conveys a sense of completeness and sophistication, often used for section endings or to enrich the dominant in complex progressions. The thirteenth adds an 'airy' and melodic note that makes it particularly elegant.