Final Fantasy XIII: Original Soundtrack Catalog # Composers Arrangers Producers Publisher CD Info Length Release date Final Fantasy XIII: Original Soundtrack is the complete soundtrack for the Japanese version of Final Fantasy XIII. Vocals were performed by Sayuri Sugawara for the theme songs "Kimi ga Iru Kara" and "Eternal Love". Nobuo Uematsu was originally announced as the composer of the game's main theme, but later decided to give his main theme duties to Masashi Hamauzu after being hired to work on Final Fantasy XIV.