I REALLY didn't like that spanish/mexican?-style Chocobo song.
I think having dresspheres that only certain characters could use would have made you think a bit more about what you chose to level up, because there was really nothing that made you *want* to have Yuna as a Dark Knight or Paine as a Samurai... rather than "everyone can do everything".
Better Songstress "Sing" music for each ability instead of a half-hearted "la-la-la" would have been a nice touch too.