Katy Perry fully embraces the craziness of Glastonbury Festival with her over-the-top Pyramid stage set and energetic performance. She starts off with some songs from her album “Witness,” but everyone knows what the real reason they’re there for: pop hits. Katy delivers on that front with fan favorites like “California Gurls,” “Dark Horse,” and “Teenage Dream.” During her set, she grinds on security, runs along the front row, and even crowd-surfs during “Roar.” Overall, Katy is totally onboard with the mayhem of Glastonbury and enters fully into the spirit of the festival.