Resurrectors of Black metal they with Bathory evolved the style from oldstyle power-chord carping (Venom, Celtic Frost) to newly nihilistic and feral styles of simplicity and oblivion while not yet shaking the pervasive heavy metal influence of older bands. In the beginning clumsy while later rhythmic and violent, the music of Mayhem introduced complexity and a far-reaching aesthetic and conceptual vision to early black metal and created a foundation for much black metal to follow.