Since the beginning of its Norwegian incarnation, black metal has challenged popular notions of what it means to be a metal band. Euronymous and Fenriz spearheaded a renewed interest in genres not in vogue at the time - roots thrash and NWOBHM being the most obvious. But the second wave of black metal, with its fixation on classical music and classic metal, as well as its rejection of what was popular at the time, soon opened itself up to the encroaching influence of progressive rock. By the end of the 90's, no subgenre of heavy music was more boldly experimental than black metal. Ironically, that meant that black metal bands wandered even further from their tenets than any of the "life metal" bands that the second wave chastised.
