I can't say just one artist, but when i want to calm down i listen to classics
Sleeping with sirens for sure.
Guns n' Roses
Donovan, I guess. Usually if I'm upset I put on music that mirrors the mood, not calms it down.
Orbital Halycon on and on
Mission off of "Hold Your Fire" by Rush.
I play that song like ten times when I'm pissed.
Talk Talk, Eyeless in Gaza, Cocteau Twins...
I totally know what you're talking about. Lol. I feel stressed or annoyed by a situation I play "The Beautiful People" and I'm good to go after that.