What's a good boss battle song for a protagonist who was turned insane and physically corrupted by eldritch horrors fighting his former allies. Really disturbing lyrics are preferred but not necessary?

Personally, some of my favorites; Snuff - Slipknot. This song is beautiful. It makes me want to cry. Cold - Crossfade. Pushing Me Away - Linkin Park You Know You're Right - Nirvana Long Hard Road Out...

Country- Sideways, Boots On, Chicks Dig It, Big Green Tractor, Small Town USA, Rockin the Beer Gut, and Goin Through Hell Pop - Fireflies, Weightless, Damned If I Do Ya, Fire Burning, Must Have Done...

all my life -K Ci and Jojo and Quando by Micheal Buble`

A few:Streetcorner Symphony: Rob ThomasWe R Who We R: Ke$haRaise Your Glass: P!nk

Ones that aren't completely direct and require philosophical thinking.