Three years after release of Katy Perry's multiplatinum album Teenage Dream, the pop superstar boldly returns to spotlight with PRISM. As the lead songwriter of the album’s opening track, “Roar,” Perry kicks off ther third studio endeavor with stadium-sized guitars, a stomping midtempo beat, and an epic single-along hook. Perry’s assertive return is underscored by other early tastes from the album, including “Dark Horse,” which features a menacing bass line, crackling beat, and sharply styled guest verse from Juicy J, PRISM’S parade of singles continues with banging house-influenced groove and whistling hook of Perry’s euphoric, party-all-night anthem “Walking On Air.”