My Sangheili (SERIOUSLY, Infinity, give the poor lady some armor that fits her less awkwardly, please!) has been attempting to find good music that she would listen to in the heat of battle for years now. She's tried many genres and decades of human musical entertainment, from metal, to gospel, to classical and even oddities like electro swing, but nothing truly strikes her fancy other than one or two songs for a respective genre. I guess the best answer is "whatever the heck she wants!".
Maybe she's just picky. But she intensely dislikes rap and country, so... I guess she kinda narrowed it down? xD
Yea, I can’t do rap either, and some country songs are ok, but there are some that should never see the light of day. I can see how classical can be interesting on a battlefield, since most classicals are for peace and serenity. Like listening to Mozart while gunning down enemy Spartans with a chain gun. Or Beethoven’s 5th while looming over a hill with a tank.
I personally do a lot of electrical music like Kygo, but everyone has their preferences. Just do what makes you happy, or just make you wanna do better, like the Final Countdown, or Eye of the Tiger