Very interesting.
Though I've never played FF6 before, it was amusing because I know how true it is for friends to start singing or humming their favorite video game songs at the most random moments.
I also liked how you made the animation in sync with the sound by mouth movement and added body movement. Some animators completely ignore that factor.
Also to the people viewing this animation, please don't give a low score only on the fact that you may not have heard the song before.
I recommend people who have never played FF6 or heard its music to hear the song either before or after they see the animation, it could make a world difference (for the good of course).
Nice job again.