To call Black Sabbath's reach long is a gross understatement. On “The Trooper”, Iron Maiden transform their lumbering pummel into a galloping war cry laced with ornate fretwork; Black Flag's “My War” fuses a similar feel to hardcore punk's chaotic rage. One of their most faithful disciples is Kyuss, whose stoner-rock anthem “Green Machine” is a love letter to Tony Iommi's smoke-shrouded riffs.