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Stapleton to Sing: Jean Stapleton, who sang off-key during her stint on “All in the Family,” will sing on-key as Aunt Eller in the L.A. Opera’s production of “Oklahoma!” opening June 22 at the Dorothy Chandler Pavilion. Stapleton, starring in CBS’ “Bagdad Cafe,” has performed on Broadway in other musicals such as “Damn Yankees,” “Funny Girl” and “Bells Are Ringing.”