GLASTONBURY, ENGLAND – JUNE 24: Dave Grohl of the Foo Fighters performs at the Glastonbury Festival site at Worthy Farm in Pilton on June 24, 2017 near Glastonbury, England. Glastonbury Festival of Contemporary Performing Arts is the largest greenfield festival in the world. It was started by Michael Eavis in 1970 when several hundred hippies paid just £1, and now attracts more than 175,000 people. (Photo by Matt Cardy/Getty Images)