Pop’s edgiest eccentrics all roll a bit of Gwen Stefani’s sass, silliness, and sophistication into their own singular style. There’s a little ska-punk angst burning through Paramore’s emo anthems, and even a touch of her reggae-pop roots in Ariana Grande’s most risque confessions. Meanwhile, Lady Gaga, Kesha, and Demi Lovato have their own “Hollaback” moments with slick, salacious songs cut straight for the dance floor.