By the ’10s, decades of sophisticated cross-pollination had collapsed the borders between metal's many niches and eras. Such fluidity opened the door for plenty of innovation, whether in the form of Deafheaven's churning post-rock cyclones, the electro-injected metalcore of Motionless In White, or Red Fang's buzzy stoner sleaze. Better still, this creative malleability inspired the genre's titans to bulk up their sound: '80s thrash mavens Megadeth unleash some wicked riffage on the propulsive "Dystopia," while nu-metal icons Slipknot exhibit crisp dynamics on "The Devil In I."