“When the title cut of Ginnungagap, the second LP by Norse-obsessed Kentucky miscreants Seidr, first cracks open, it feels like staggering, malevolent death metal as Cookie Monster vocals break like rocks over belligerent drums and a wide-angled riff. But each moment of motion reveals that there’s a ghost clearly in this machine, some engrained idiosyncrasy tearing the track apart from the inside. ”