An interview with Pete Battistini, author of two comprehensive books about the 1970s and 1980s era of "American Top 40." He chats about his first meeting with Casey Kasem, when the program was sounding the best, the different Casey Kasem "eras" on the show, his most-special piece of AT40 memorabilia that is in the books, and how he came up with the idea to create AT40 mugs.