“(Theory) Yuna was able to vocalize the The First Town OST...

“(Theory) Yuna was able to vocalize the The First Town OST because while in Aincrad, the players were able to hear the background music while they weren’t preoccupied with communicating with [other players or NCPs. The music’s intensity increased during boss clearings to help the raid teams keep their focus and minimize as many casualties during the fighting.]”