#5: Final Fantasy IX
With quite an amount of memorable tracks, one of my favorite villain themes in the series, as well as very good battle themes, FFIX definitely has a great soundtrack. Fairy Battle is my ringtone^^

#4: Final Fantasy VI
The character themes! Really. Terra, Edgar, Setzer, Shadow, Kefka, gotta love the character themes in this game. And of course that's not all. The soundtrack of this game has a lot of variety and makes the individual great composition stand out all the more. And did I mention Dancing Mad?

#3: Final Fantasy X
Final Fantasy X's soundtrack is one I considered average for the FF series for quite a while. However, not only does it have my two favorite track out of all FF (To Zanarkand and Fleeting Dream), it also has very good supplementary tracks. Most of the area crossing themes are quite catchy (Silence before the Storm, Movement in Green, Thunder Plains, ...) and it also has some pretty good character themes and remixes.

#2: Final Fantasy VII
What I admire about FFVII's soundtrack is how it all fits together so nicely. Between Aerith's Theme, Anxious Heart, the overworld theme, Sephiroth's Theme and a ton of other tracks, it always seems to fit the situation perfectly. Not to mention the tracks themselves are very very good.

#1: Final Fantasy VIII
This is not only my favorite sountracks in Final Fantasy, but my favorite soundtrack in gaming in general. Final Fantasy VIII - I find it hard to think of tracks I do not care for. Its themes in all general areas (battle, towns, etc.) are all high above average and it has so many tracks I just outright love. The Extreme is my all-time favorite final boss theme. The Castle (also my favorite track from FFVIII's soundtrack) is my favorite final dungeon theme. And between Don't Be Afraid, Force Your Way, The Stage Is Set, Under Her Control, Shuffle or Boogie, Overture, Mods de Chocobo, Movin, The Oath, The Man With The Machine Gun, ... - I could go on but I think you get the point - it easily deserves the top spot on my list.