"And the bands themselves don't want empty secret sets do they? In the past couple of years, some acts have begun harnessing the buzz about secret sets for PR purposes for their album or tour, Ad believes. "It used to just be friends of the festival, whereas now people are like, 'If we do the secret set we're going to get loads of hype and media attention'." That was one of the more exclusive secret sets in Glastonbury history. "There are reports that it was the biggest crowd on the Park Stage for a secret set ever.