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This Wednesday, March 26, Michael Gordon’s “Rushes” will have its local premiere at Tufts University’s Granoff Music Center. The performers are the seven bassoonists who gave the work’s first performance in 2012, and who were members of the consortium of thirty bassoonists (organized by Dana Jessen) that commissioned the piece from Gordon, a founding member of the Bang on a Can collective. (This performance opens a brief tour marking the release of a recording of the work on Cantaloupe Records.) Even within the classical-music world — which has been trying out different instrumental combinations for a millennium — an ensemble of seven bassoons is a conspicuous novelty. “Rushes,” to its credit, makes one wonder what took so long.