With great films such as "The Conformist" and "Last Tango in Paris," Italian director Bernardo Bertolucci drew rave reviews in the face of controversy. But with his 1979 melodrama, "Luna," in which an American opera singer has an incestuous relationship with her drug-addicted son, Bertolucci took a critical drubbing. Vincent Canby of the New York Times called the film, "the work of a good poet on an absolutely terrible day." In my talk with him from 1979, the late auteur says critics missed the humor in "Luna," and discusses other films of his including "1900."