The riff, a simple repeated melodic phrase, is a foundational element of heavy metal, but it's been mutated, warped and redone dozens of times since the likes of Black Sabbath and Deep Purple forged the tradition. Backwoods Payback, of Westchester, Pa., doesn't go for tar-tempo doom-drones or frenzied firestorms; rather, the band's heavy groove-oriented hard rock is more in line with Clutch or Danzig. This riff-centric approach is complementary to the slate of openers, though: From the psychedelic infusions of Chapel Hill's Bitter Resolve to the fuzz-burdened blues riffs of Durham newcomers Church of Wolves, tonight, the riff rules. Also, Virginia's Akris. —Bryan C. Reed