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.
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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: