Just so you know... the 'Last Mission' soundtrack that Jalbrean mentioned includes the English versions of the songs, and other new tracks from the 'Last Mission' bonus disc that was released in Japan only. So basically, there album has the English songs and few other tracks that you'll have never heard before.

The full soundtrack to the game has two complete discs, with all the music from the game, but the songs are in Japanese (they're really nice, though).

If you want a sneak preview of what's on both the 'Original Soundtrack' album and the 'Last Mission' soundtrack, the Eyes on FF frontsite has them all