Leonard Lopate, 77, who has hosted a popular midday talk show about books, culture and society for 32 years, was escorted from the building on Wednesday, about an hour before his program was to begin; he says management has refused to tell him what incidents led to his suspension. Also off the air is Jonathan Schwartz, who hosts weekend music shows and the online-only Jonathan Channel, both focused on the Great American Songbook. (includes audio)