Don't Break the Oath
King Diamond, the singer and leader of Mercyful Fate, painted his face with upside-down crosses and wrote lyrics about Satan, Hell, and things like that.  Hank Shermann, the band's guitarist, played very fast and with a lot of guitar solos to help make the band sound evil.  Mercyful Fate had already started to do these things in 1983 with their last album, Melissa.