The Concerto's headstock is an “X” that is shaped like the upper half of the Nobody insignia. It is mostly grey, but the tips of the "X" are violet. The Sitar's neck is violet and has ridged, grey edges. The body has a roughly semi-circular shape, and its base is lined by five silver spikes. The upper half of the Sitar's body is predominantly violet, and the lower half is predominantly pale yellow with two thin, violet sections on its sides. The Concerto has three white strings that are anchored to the lower half of the body.
Musically, a concerto is a three-part musical work in which one solo instrument is accompanied by an orchestra.
The Concerto's ground combo starts with a quick leap forwards, thrusting the Sitar diagonally upward, followed by Demyx performing a 360° spinning diagonal slash with the tip of the Sitar. The next move of the combo is a quick thrust of the Sitar diagonally upward, followed by another 360° spinning diagonal slash. The combo then ends with four quick blasts of yellow sound waves in an outward direction.
The aerial combo consists of a series of very fast airborne spinning attacks, followed by a blast of three yellow sound waves forwards.