Fans will be super stoked: The Serenity of Suffering is Korn’s heaviest slab since the late ’90s. Ditching the dubstep-informed electronics found on the previous two albums, the band instead unleash first-generation nu-metal blown out with thrashy, groove-metal dynamics. “Rotting in Vain” is a hellish onslaught of funky syncopation, throat-trashing howls and downright bummer angst. Featuring a cameo from Corey Taylor (Slipknot, Stone Sour), “A Different World“ is a bi-polar seesaw ride between darkly elegant melodicism and grunting, lunging breakdowns. Guitarists James Shaffer and Brian Welch deserve co-MVP honors. On track-after-track their interlocking fretwork is like a pair of coiled snakes that wrap themselves around the rhythm section.