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Maybe the collaboration between minimalist composer Arnold Dreyblatt and trio Megafaun on 2013’s Appalachian Excitation (Northern Spy) seemed odd at first: the former came up in the fertile underground experimental NYC scene of the 1970s, while the latter keep to the hills of Durham, North Carolina, propagating an off-kilter brand of psych-touched folk. But Dreyblatt, who’s been based in Berlin since the 80s, is both an innovative and an adaptable avant-garde composer, unreluctant to build rhythms upon which to elaborate.…