The official page, ff12.com, now allows you to listen to sample tracks of the game's soundtrack.

Here. (http://www.ff12.com/music/index2.html)

Composed by someone called Hitoshi Sakimoto, who imdb.com says is the composer for Vagrant Story, FF Tactics and Legaia 2: Duel Saga.

At least one track reminds me on Chrono Cross... which makes it good. :P