Return for an evening to the heady thrills of last year's John Cage centenary as Richard Carrick conducts the members of Either/Or in a composite salute by 125 contemporary composers—including William Bolcom, Jason Eckardt, Kamran Ince, Lei Liang, David T. Little and Keeril Makan—each of whom crafted a tiny piece spun off from a few notes provided by a fellow composer.