**1/2 A Late Quartet A smartly cast, discreetly contrived melodrama about classical musicians, with retiring cellist Christopher Walken upsetting the delicate balance of his string quartet. Philip Seymour Hoffman, Catherine Keener, and Mark Ivanir are the other players; the music is sublime but the situations feel pat. Fans of the actors (and of Beethoven) should still check it out. (105 min., R) (Ty Burr)
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