MILWAUKEE (AP) - Miller Brewing is celebrating the "50th Anniversary of Rock 'n' Roll" with eight commemorative beer cans that feature Rolling Stone cover shots of Elvis Presley, Blondie and others. What's missing, some say, is a black artist. Robert Thompson, a professor of pop culture at Syracuse University, called the absence "beyond conspicuous," because black artists often are credited with inventing rock 'n' roll. "It would be like doing a set of cans of six great Impressionist painters and not including any French people on it," he said. "It leaves out an enormous amount." The promotion, which ties rock's...