AT TANGLEWOOD: Paul Lewis, Emerson String Quartet extol Beethoven’s final works: ‘It must be’

Lenox — Ludwig van Beethoven inscribed his last string quartet, “The hard-won resolution” (Der schwer gefasste Entschluss). Toward the end of its second, final movement, the published score bears a profound thought, to be expressed by the viola and cello: “Must it be? (Muss es sein?)” They play a dramatic, three-note melodic fragment, set in