From Taste Of Cinema:
"Heavy metal music has always been either wholeheartedly embraced, its musicians revered as demigods by legions who worship them, or simply written off as nonsensical noise punctuated by screaming. Aside from rap, no other genre in music history is more adored and reviled in equal measures. Even during the 1980s (metal's heyday as the most popular music in the world), there was seldom any middle ground.
But like anything else which reaches the status of cultural relevance, heavy metal found its way onto the big screen through concert films, documentaries, comedies and – with obvious inevitability – horror movies. Once the genre gained a foothold in our public awareness (whether we wanted it to or not), metal became the subject of numerous films, both fictional and non-fictional." (Read more on the website)