For me, it‘s Bohemian Rhapsody!
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I'll be boring and name my favorite song ( which I mention in all music questions!) " Be all things" by Chelsea Wolfe..... I listen to it daily, sometimes multiple times ...... I just love it!
Dopesmoker by Sleep. Its literally an hour-long dirge. So I would listen to Dopesmoker on repeat I guess. lol
Anything by Bon Jovi, but specifically "This Ain't a Love Song". I can listen to that song over and over and over.....in fact.....it may be time to turn Spotify on.....