Alice Cooper has already lived thousands of lives, if you count them by the number of times the shock-rock pioneer has guillotined himself onstage. In his new book, Devil on My Shoulder: A Memoir, due Oct. 6, the singer, 78, promises to reflect only on his one singular life. The singer’s publisher is promising the book will be the “definitive autobiography,” a notable distinction since he’s published his life story twice already, in Me, Alice (1976) and Golf Monster (2007). This book will