CRITIC’S CHOICE
Either/Orchestra, Saturday, October 15, at the Bluebird Theater, is the odd, eccentric, precocious (but dearly loved) brainchild of composer/ saxophonist Russ Gershon. And a hardy youngster it is, for the Boston-based ten-piece jazz ensemble is now celebrating its ninth year of life. This longevity is quite an achievement: Aside from…