Originally Posted by
Enkidoh
Which one? There was actually two FFXI battle themes used in that event - Battle in the Overworld #1 for the first three FATEs, and Battle in the Dungeon #1 for the final FATE (and that's not including Recollection which plays during the cutscenes in the event).
Unfortunately, as the event didn't feature orchestrion rolls offered as a reward the first time the event was run (and the earlier Shantotto-themed event happened long before the Orchestrion was even added to the game), and as SE did not add any new rewards to this event for it's second run, this most likely will not change in the future sadly.