Ok! Let me show you this trailer (in the middle of the IGN page):
http://psp.ign.com/articles/911/911226p1.html

Everybody knows Yggdra for its fantastic music, but what the hell is this beautiful song from the trailer? I'm listening to it for a week yet, but I really don't know the artist or the song name. I've got the OST released with the game but this song is missing.

Please can anyone help me?

Thanks! :D