There’s a new definition of literature in town. It has been slouching toward us for some time now but may have arrived officially in 2009, with the publication of Greil Marcus and Werner Sollors’s A New Literary History of America. Alongside essays on Twain, Fitzgerald, Frost, and Henry James, there are pieces about Jackson Pollock, Chuck Berry, the telephone, the Winchester rifle, and Linda Lovelace. Apparently, “literary means not only what is written but what is voiced, what is expressed, what is invented, in whatever form” — in which case maps, sermons, comic strips, cartoons, speeches, photographs, movies, war memorials,…