“Four years ago, I bore witness to the musical mismatch of the century: Eleventh Dream Day opening for Thrill Jockey label mates Tortoise. All the look-alike post-rock Tortoise followers, sporting the fluorescent rave garb and matching backpacks seemed genuinely flummoxed by the band. As these grizzled, perennially underrated veterans roared through an uptempo rocker, frontman Rick Rizzo laid into ”