The Unknown (track)

"The Unknown" is a musical composition by Yoko Shimomura and Kaoru Wada. It appeared in the Kingdom Hearts Concert -First Breath- live performance. The piece is a medley of the secret boss themes from Kingdom Hearts Final Mix, Kingdom Hearts II Final Mix, and Kingdom Hearts Birth by Sleep Final Mix.

Composition
"The Unknown" is five minutes and 40 seconds long in the Kingdom Hearts Concert -First Breath- album.

The medley features "Disappeared", "Rage Awakened", and "Dark Impetus", the boss themes of Xemnas, Lingering Will, and Young Xehanort, respectively, during their appearances as secret bosses. The title of the medley refers to the fact that secret bosses are often labeled as "Unknown" (謎の男), as was the case with Xemnas and Young Xehanort.