I've looked through the FF OST's and can't find:

Music Fantasy Tactics - La grand grimoire

If you looked on the main site FF stuff isn't there.

And if you checked that enormous FF thread in the download section, the link might have bit the dust and been removed.

http://www.tagtuner.com/music/albums/Various-Artists/MUSIC-FANTASY-TACTICS-_-la-Grand-Grimoire-_-Disc-1/album-v21128d7

That's the album. I just didn't think it would be this hard to find =\