I have definatly heard "Here's to my sweet satan" in stairway, I think it's pretty badass, it could really just be a freak coincidence

It is well known that Jimmy was very interested in magick and he even purchased the famous occultist Alester Crowly's house

I think his interest in that stuff was more for show than anything, I highly doubt he ever sacraficed anything or drank goats blood

my friend and I watched a Zepp bootleg for 77' last night and it was terrible, Jimmy was bone thin (heroin) and could barely play, It sounded like he was one fret off the entire time, it was just plain bad, but jone paul jones's keyboard solo's in "no quarter" were amazing, along with Bonham's drum solo