The list author says: "When people talk about being "well read," they mean the knowledge of great books and the ability to discuss them. The purpose of these lists is to do the same for heavy metal music, giving you a list of the real standouts in the genre and why they're important."
"Not quite metal, but having left rock behind, this early music started the metal subculture and a quest to make good on the promise of these early albums. Importantly, the band name (Black Sabbath) and sound were inspired by horror movie soundtracks, specifically those written by Italians."
"During the explosion of late 1960s progressive rock, one band decided to make music that reflected the disturbing and uneasy side of life. King Crimson combined extreme musical literacy with jarring sounds of distorted guitar, paving the way for future progressive metal."