4 stars out of 5 -- "The compelling ‘Hey Hey Hey’ sees Katy dressing up Lorde’s languid, spacious sound, adding some serious girl power...", "It’s refreshing to hear Perry distance herself further from the PG-rated fun of TEENAGE DREAM....Still, this is a Katy Perry record, so she wisely serves up a few sugar rushes." -- Grade: B, "'Mind Maze,' one of the Purity Ring songs, features some cool vocal manipulation that adds a new texture to Perry’s discography.", 3 stars out of 5 -- "With the gospel-choir-assisted 'Pendulum,' which brings a vintage Perry vocal performance to some late-Eighties filigrees by Kanye producer Jeff Bhasker."