Please bear in mind that any of my choices change from moment to moment. I would have to go easy route, so excuse me for being so cliche...
Every tank. I feel all three have something that makes this song suitable for them. Manowar Warriors of the World: https://youtu.be/Dll329ggLIY
PLD: Accolade / Accolade II Symphony X https://www.youtube.com/watch?v=Sr4gPS0gpdE / https://www.youtube.com/watch?v=6Kb8SVgbzgM (You will have to excuse me because I am by heart a PLD so I am always looking for music that could potentially be "White Knight" Mode)
DRK: Not gonna die, Skillet https://www.youtube.com/watch?v=8XGtsz03X48
Sorry I really was hoping to find something else...
WAR: Feel Invincible, Skillet https://www.youtube.com/watch?v=Sf9NSd_2avA
unless... and you might hate me...
WAR: Titanium, https://www.youtube.com/watch?v=1UlRIbpYTwk This version specifically.
aaah... too many to chose.
or
Iron, Within Temptation https://www.youtube.com/watch?v=sz2qeb_0Se8