Mellencamp, Cohen inducted as well
                                
                                
                                    (Newser) -
                                    With a wink and a nod, Madonna became a Rock and Roll Hall of Famer last night, along with John Mellencamp and Leonard Cohen, Billboard reports. Madonna got top billing, with Justin Timberlake giving her an innuendo-laden induction speech, and Iggy and the Stooges performing punked-up covers of “Burning...