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Preceded by seven years of silence and teased for weeks through a carefully crafted blitz of online clips, codes, and clues, the new Boards of Canada album could have collapsed under the weight of its avant-hype. Instead – and like My Bloody Valentine’s long-delayed re-emergence this year with “MBV” – “Tomorrow’s Harvest” is as strong a return to form as it is stunning an update, with the Scottish duo expanding and refining their signature blend of nostalgic sonics and futuristic sheen. Songs like “Cold Earth,” “Reach for the Dead,” and “Sick Times” are familiar specimens from the Boards of Canada ecosystem, with dramatically hue-shifting analog tones, and disembodied voices that crackle through like birdsong. But these 17 songs are rich with surprises.