Since her last album proper, 2010's Animal, lurid chart-pop siren Kesha has been behaving oddly – befriending Iggy Pop and Alice Cooper; giving blood to the Flaming Lips. A little grit has rubbed off. Dirty Love is a roustabout rock tune, featuring an amusing intercession from Iggy, while Supernatural essays a little tokenistic dubstep. Really, though, her graceless output remains unaffected. Mostly overseen by Max Martin and Dr Luke, Warrior is dance-pop-by-numbers, inflected with guitar. Kesha's strident rap retains all its obnoxiousness on the title track. Notionally rebellious tunes such as Crazy Kids, meanwhile, continue to perpetuate the flawed notion that party people are a beleaguered minority in need of Kesha's leadership.