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Not many flute concertos suggest the grandeur of a Wagner opera. Fewer, likely, take inspiration from Jethro Tull, the progressive rock band that packed arenas in the 1970s and ‘80s. But these are among the ingredients in Aaron Jay Kernis’s Flute Concerto (2015), which flutist Marina Piccinini performs on a new Naxos recording with conductor Leonard Slatkin and Peabody Symphony Orchestra.