LoFi tunes are always the best for spacing out and going into work mode. I'm sure there's some stations on Spotify or something, just type in "lofi" and I'm sure hundreds of stations will pop up, any will do. The genre of music mostly consist of instrumentals and remixes. Buuut, if you were looking to maybe evoke a dark theme or mood try Abominable Putridity, Cannibal Corpse, Gutteral Slug, and their all in the genre of death metal or subgenre grind core lol or try Nargaroth their sorta like viking metal