The bar music was actually me banging away on a real piano. I used to be able to play, but as you can see not so much anymore. I'm not sure what Sacrifice you're referring to, so it's probably not an intentional reference.
Nice! I loved that track. I was referring to this https://en.wikipedia.org/wiki/Sacrifice_(video_game) because the incantation reminded me of the ones used there, but maybe I'm mixing something up... D: