I noticed that whenever I play this game, I've attached certain songs to each character, for instance, I can't fight Kefka or Sephiroth without playing there final boss them in the background. I also tend to gravitate towards one battle theme for each of the heroes.

WoL - FFI Town Theme
Garland - Dungeon
Firion - The Rebels
Emperor Mateus - Battle Theme 2
Onion Knight - Crystal Tower
CoD - This is the Last Battle
Cecil - Red Wings
Golbez - Battle of the Four Fiends
Bartz - Battle on the Big Bridge
Ex- Death - The Decisive Battle (FFV)
Terra - Battle to the Death
Kefka - Dancing Mad
Cloud - Opening ~ Bombing Mission
Sephiroth - One-Winged Angel
Squall - Man With the Machine Gun
Ultimecia - The Extreme
Zidane - Battle Theme 2
Kuja - The Darkness of Eternity
Tidus - Battle With Seymour
Jecht - OtherworldShantatto - Awakening
Gabranth -Fight to the Death

Does anyone else choose specific themes or do you just stick to your favorite themes regardless of who is fighting?