Some records open doors, giving birth and lending credence to entirely new sub-genres. In 2013, Deafheaven’s Sunbather did precisely that, firmly demonstrating that dark metal needn’t be the preserve of neck-bearded Northern European doom-mongers, instead invigorating the genre with melody, lyrical tenderness, and a depth of musical arrangement and instrumental diversity almost previously unheard of within its traditionally insular enclave.