Here are some of mine (first 3 are obvious):

-One Winged Angel
-Main Theme
-Aerith's Theme
-Descendant of the Shinobi
-Farm Boy
-Ahead On Our Way
-Tifa's Theme
-Dear to the Heart
-The Highwind Takes to the Skies (kind of a sped-up Main Theme)
-Other Side of the Mountain


You can make a Top 10 if you want....