This may be cheating since it was used in LotR, but "I see fire" by Ed Sheeran
That and Castle On The Hill, respectively, are lynchpin songs in my playlists for my two 5e rogue characters.
Dresden’s love of his shipmates, and the horror of seeing them killed by a necromancer and used as undead minions, and his guilt about surviving by being in town haggling when it happened, are represented in I See Fire. “If we’re to die tonight, we shall all die together.” Not so much, it seems, and it haunts him.
Finnan wants nothing more in life than to settle down on a small plot of land, grow food and raise critters, and maybe have a family. He wants, in short, to go home. He recalls his youth, the golden fields and green woods of home. His family and friends who he always meant to return to.
He can never go home. He is displaced in time, raised from the dead by a shadowy god of thieves and assassins, and is now a darkling thing. So the playlist starts with Castle On The Hill.
Then for another character there’s AFI’s So Beneath You, and Prelude 12/21. Khalid the shader-kai Monk was an arena slave for over 20 years. His life was blood and sand and the roar of the arena. Prelude 12/21 brings to mind the moment before the gate is raised, as he waits, letting the drum beat of the impatient crowd quicken his heartbeat, and drive him into the frenzy he needs to win, the stimulus he needs to stay sane. The final “close my eyes and lay me to...sleep.” Fills my mind with the image of him rushing impatiently under the raising gate toward his opponent, only to disappear, and reappear above them, all whirling chain and razor sharp grin.
So Beneath You feels almost written for Khalid, and his best friend Vidanyia, who is a Blood of Vol Paladin. “There is no one above, and I won’t serve anyone.” And “I won’t kneel! I won’t bow! If you’re there God Strike me down, Strike me down. Oh you’ve got nothing!” Perfectly encapsulate how these characters view the gods. If they do exist, who cares?
As far as dnd in general, for some reason Tank! from Cowboy Bepop.