However, in 1969, the first openly Satanic bands began making their appearance. Perhaps first and foremost were Black Widow, who sometimes shared gigs with Black Sabbath. Black Widow's 1970 debut, Sacrifice, is a pro-Satanist offering with titles like "Way To Power" "Come to the Sabbat" "Conjuration" "Sacrifice". Not a heavy metal band or even a hard rock band, Black Widow's music was creepy and, in places, corny. But it was the first attempt in rock to bring underground Satanism to the mainstream, and the first case of Satanism being the point of the music, and not just one of its devices. Onstage, they performed Satanic ritual, which included the participation of a nude woman celebrant.
It was also around this time when Jimmy Page, a known Crowley aficianado, supposedly convened Led Zeppelin for a little bit of soul-trading with the devil in an effort to assure their success, in much the same way Robert Johnson had. While the story is probably as apocryphal as Johnson's, who really knows? Page eventually bought Crowley's castle; Led Zeppelin IV (or zoso) and "Stairway to Heaven" in particular, was hailed by Kenneth Anger as one of the greatest Satanic works ever. A 1974 car accident seriously injured Robert Plant and his wife, drummer John Bonham died in 1980. Both events were speculated to be early paybacks for their deal.
As the 1960's wound down and the 1970's picked up, Satanism as a movement was on the wane. However, the success of Black Sabbath, and heavy metal's fascinations with power, death, and doom, meant that Satanism had forever found a niche in rock; as long as there were tormented teens looking for thrills, there'd be a place for evil symbology.
Part III: The 70's and 80's
So in the 1970's and 1980's there was no shortage of heavy metal and hard rock acts that used Satanism either explicitly in a pro-Satanism sense, or in an ambiguous thing-to-fear sense. A partial roster of such bands include Angel Witch, Venom, Pagan Altar, Widow, Witchfynde, Hell Satan, Cloven Hoof, Warhammer, Onslaught, Sabbat, Antichrist-Ragnarok, Cradle Of Filth, Megiddo Bal Sagoth, December Moon, Ewigkeit, Adorior, Hecate, Enthroned, Phantasia, Forefather, Meads Of Asphodel, Reign Of Erebus, Thus Defiled, Old Forest, Annal Nathrakh. Few of these bands ever sold many records, although Venom, which included blasphemous doggerel on the album covers, became a favorite of severely disaffected youth in the 80's.