you are on this final map and you can see everyone tensed, the scion is telling you "this is it the final fight yadayada" and all you need to is reach that part of the map.

then you pop your mount and suddenly an overly cheerful music start and you fly through the map with this cheerful and happy music while everything around you is doom and gloom.

turn it off in the setting and never touch it again. on some occasion it feel so "out of place" lol. iam the type who always try to "into" the storyline, not to the point of RPing but i always make my character act and dress accordingly to the situation at least during the storyline (a proper armor and such instead of full chocobo outfit during final boss etc)