Singer Pharrell Williams performs on the Pyramid Stage at the Glastonbury music festival on Saturday, June 27, 2015 at Worthy Farm, Glastonbury, England. (Invision/AP)
Pharrell Williams performs on the Pyramid stage during the Glastonbury music festival on Saturday, June 27, 2015 at Worthy Farm, Glastonbury, England. (Invision/AP)
Singer Paloma Faith performs on the Pyramid Stage at the Glastonbury music festival on Saturday, June 27, 2015 at Worthy Farm, Glastonbury, England. (Invision/AP)
Kanye West, left and Kim Kardashian, centre, speak to an unidentified friend as they arrive by helicopter at the Glastonbury music festival, before West plays the main Pyramid stage, on Saturday, June 27, 2015 at Worthy Farm, Glastonbury, England. (Invision/AP)
Adele backstage during Glastonbury Music Festival on Saturday, June 27, 2015 at Worthy Farm, Glastonbury, England. (PA via AP)
Singer Paloma Faith poses backstage during Glastonbury Music Festival on Saturday, June 27, 2015 at Worthy Farm, Glastonbury, England. (Invision/AP)
Music fans wearing rain ponchos and wellies, walk through Glastonbury Music Festival as it starts to rain on Friday, June 26, 2015 at Worthy Farm, Glastonbury, England. (AP)
Nadezhda Tolokonnikova, left, and Maria Alekhina, right, of Pussy Riot perform at Glastonbury Music Festival on Friday, June 26, 2015 at Worthy Farm, Glastonbury, England. (Invision/AP)
Festival goers enjoy the music of Alabama Shakes during a shower at Glastonbury Music Festival on Friday, June 26, 2015 at Worthy Farm, Glastonbury, England. (Invision/AP)
A general view of the Glastonbury Music Festival on Thursday, June 25, 2015 at Worthy Farm, Glastonbury, England. (AP)