Musique pour la Tristesse de Xion - Kingdom Hearts Piano Collections: Field and Battle

Official sheet music can be purchased from here:
http://www.squaresound.com/catalog/ki...

Sales support the artist(s) who composed the music.

Musique pour la Tristesse de Xion - Kingdom Hearts Piano Collections: Field and Battle

This translates roughly too, Music for the sadness of Xion
if you were interested.