Katy Perry y Pepsi ya publicaron parte de las letras de #‎DarkHorse y #‎WalkingOnAir, 2 canciones de #‎PRISM! "Just when I think I can't take anymore We go deeper and harder than ever before We go higher and higher I feel like I'm already there... I'm walking on air Tonight I'm walking on air I'm walkin on air. I'm walkin on air Tonight I'm walking on air"