I would go back to re-fight De Rol Le just to hear the boss music. Kind of an annoying fight, but that music.
View: https://www.youtube.com/watch?v=5UFiKzw1ECw
One that comes to mind is the Ifrit fight in Vagrant Story
View: https://youtu.be/ZqpdsieTL_s?si=t7Hyo-aTB-dk9pYy
That and Malekith's from Elden Ring hit the same for me
First two that come to mind:
TOTK: Colgera battle
View: https://youtu.be/WFB8UOt01Io?si=uonjEVDfbfXbRUdW
More recently, the Bahamut theme in Final Fantasy XVI through the long fight
View: https://youtu.be/ERLXW_I4gKQ?si=nASBpxxn2pyxJzk1
Every boss fight in Nier: Automata, no? The OST elevates a good game to incredible levels!
This is my favorite most recent example, and the other one is also from a Final Fantasy title. The Jenova battle in FF7 Remake has an excellent accompanying piece, but the moment you reach the final phase of that battle, it becomes simply perfect.
View: https://www.youtube.com/watch?v=5AL4A86Fd1Y
I would go back to re-fight De Rol Le just to hear the boss music. Kind of an annoying fight, but that music.
View: https://www.youtube.com/watch?v=5UFiKzw1ECw