Christopher Guest’s half-funny mockumentary follow-up to Waiting for Guffman and Best in Show imagines a Town Hall folk music concert organized by a stiff control freak (Bob Balaban) as a memorial to his manager father. It’s easy to laugh at the preponderance of Jews in the pop-folk scene, and see that the Folksmen (Guest, Michael McKean, Harry Shearer) are patterned after the Kingston Trio, the New Main Street Singers (including John Michael Higgins and Parker Posey) after the New Christy Minstrels, and Mitch & Mickey (cowriter Eugene Levy and Catherine O’Hara) after Sonny and Cher. But I can’t fathom why Guest and Levy had the mirthless idea of making Mitch a burned-out mental case. With Paul Dooley, Jane Lynch, and Fred Willard. 87 min. (JR)