Even after you've gone past the hard-rocking staples that helped create the heavy metal template, there's plenty more to explore in Sabbath's shadowy kingdom. Saturate your ears with an early instrumental full of beastly bite like “Rat Salad” or a raging Ronnie James Dio-era barnstormer such as “Turn Up the Night” to venture deeper into Black Sabbath's deliciously doomy realm.