4/5  'Has Gaga gone straight? She appears without makeup on the cover of an album where blues, country and rock influences come to the fore. Stephanie Joanne Angelina Germanotta (to give her full name) has been the giddiest, most determinedly peculiar and outrageous pop superstar of our era but beneath the fantasia there has always lurked a technically accomplished musician, singer and songwriter. 2013’s ARTPOP, her most extremely stylised album, was her least successful (2.5 million copies,