The opening theme for each episode is "Inner universe" (lyrics: Origa, Shanti Snyder; music: Yoko Kanno; vocals: Origa), and the ending theme for each episode is "Lithium Flower" (lyrics: Tim Jensen; music: Yoko Kanno; vocals: Scott Matthew). The original soundtrack, containing the opening and closing themes in addition to other tracks from the series, was released by Victor Entertainment on January 22, 2002 in Japan, and by Bandai Visual on November 7, 2004 in the United States.