Fine, genesizz, keep ignoring what I stated. The MAIN THEME is not the same thing as the THEME SONG (they overlap only in the case of FFIX, and still onlly partially). FFVIII had a couple of main themes - Fithos Lusec Wecos Vinosec, Blue Fields and Eyes on Me had a couple of versions too, FFX used to Zanarkand more often than Suteki da Ne.

And the main point - Leona Lewis is singing only for the EU and USA versions. The soundtrack for the Japanese version is already finished and I CAN ASSURE YOU the main theme of the game is different. So quit your whining.