Of course, that is just my opinion, and a large part of my life experiences.
But then you have groups like Swedish Sabaton, whose work focuses on the history of human conflict and war. Their music is muscular, epic, melodic and often heart rending as they remind us of the history that so many are trying to erase or falsify.
En Livstid I Krig, or A Lifetime in War is a moving account of one soldier's perspective of the Thirty Years War. Almost any of their work is worth listening to. Check out their "A Christmas Truce," or "The last Stand"
Then,there's a Finnish outfit called Nightwish. Basically the poetry of band leader Tuomas Holopainen set to what's called symphonic metal. The Greatest Show on Earth is a 21 minute masterpiece of composition. All the Works of Nature Which Adorn the World is another 31 minute purely symphonic masterpiece well worth hearing.