From old timey union fight songs (ex Workers of the world, Awaken) to protest rock. The Swedish band Nationalteatern have a great banger "Staten och Kapitalet" about that the state and the capital sit in the same boat, but it is not those who row and the whip does not lick their fat necks.
My go to is dynamic exercises that forced you to stabilise the core. Kettle bell swings (including one handed variants), halos, around-the-world, atlas swings etc. Thus combined with mobility drills from the hip (where many back muscles start) and up takes for me care of any after work pain.
Not diminishing the effects of stronger back muscles but the stretch and decompression of the spine in the hang part does it's part. I love that bit, just hanging there getting stretched from arms to arse.
Still decent bands out there? Oh bloody gosh there are! Let me just give you two, if not we'll be here until dawn. There is Icelandic Misþyrming and Finnish Havukruunu. Both leaning a little bit into more atmospheric soundscapes rather than the "pure" low-fi dissonance black metal is known for. Their whole libraries are worth listening to and searches gives you quality starting points.
I prefer -esk as it is less refined. A bit crude. Vulgar.