As we arrive at the midpoint of “Taboose” tour, certain trends have begun to emerge—some obvious, others more abstract. Each night, Goose opens the show with a set of its own, then Trey Anastasio hops in to help elevate a few of the Connecticut outfit’s originals to new heights. Trey Anastasio Band plays next, with Goose’s Rick Mitarotonda (guitar) and Peter Anspach (keys) joining in on the last few tunes. By the end of the encore, all of Goose is on stage with TAB, completing the 13-piece, two-band consortium.