I think it was kind of a catharsis of Jon as the lyrics are pretty aggressive and dark-ish. However, it is awesome. Whenever I'm in a pretty cranky place, I give this a listen and it lets me get my aggression out. Was a great catharsis for me when I lost someone.
Dr. Butcher - Season of the Witch:
https://www.youtube.com/watch?v=q-QEiCYwfOM