Yoko Shimomura composed the game's soundtrack including the main theme, "Primal Eyes". The ending vocal song, "Somnia Memorias", is performed by Shani Rigsbee. The score met with great critical acclaim, using influences from both opera and electronica. Shimomura stated that she tried to compose "inorganic" music for the game, what she described as "something unique" for the game. A separate "Parasite Eve Remixes" album was also released, containing 10 tracks remixed from the original game by various artists. The idea for the work came from a simple suggestion to Shimomura that the game's music be remixed rather than rearranged. "Somnia Memorias" was also included on the "Square Vocal Collection" in 2001.