Led xep and countless others including surf rock! were influencing hard rock (early metal) in many ways. But this one came along and just created a subgenre of occult tinged hard rock that is still with us today. It's early metal and it's still great to hear. early metal and melodic metal were about writing good songs mostly so you get that here. Song's like 'black sabbath' , the wizard' 'wicked world' and others are still biting and heavy. this one helped to define a type of metal that later went even harder and darker but still had melody and good singing. unlike , most thrash rock or nu metal. but those wouldn't exist without this one. at the same time Black Widow's album called Sacrifice was out which was prog rock! dark prog rock! so 1970 was a interesting year. ANothe first was black mass lucifer which was a album of moog electronic music that went for a dark mood and was great for halloween parties. I am not a fan of todays boring techno dance garbage but older stuff was about making strange music etc. That's on cd somewhere; but this band really made people aware of hard rock in a new way.