The line-up for this year's Glastonbury may have been announced already but organisers still have a couple of tricks up their sleeve. Speaking to BBC's Newsbeat, Emily Eavis − daughter of festival founder Michael − teased music fans by saying that they've succeeded in keeping something extra special under wraps.

"We've managed to keep some big secrets recently and there's a couple more this year that haven't gone out yet as well," she said. "There's a really big one. I haven't even hinted or told anyone it's coming and we've managed to keep it completely quiet for the first time ever."

Glastonbury has already got a head start on plans for the 2020 festival. "It's the 50th anniversary, so it's going to be a big celebration. A few people have come in early and sort of said, 'We'd really like to do that.'"

Around 135,000 tickets have been sold for Glastonbury 2017 which kicks off on 21 June and draws to a close on 25 June.

Glastonbury Festival
Glastonbury Festival has been a highlight in the music calendar since 1970 Reuters

Radiohead, Foo Fighters and Ed Sheeran will headline when the annual event returns to Somerset festival returns to Worthy Farm for another year. Other notable acts taking to the stage include Solange Knowles, Kris Kristofferson, Stormzy, Skepta's Boy Better Know collective, Dizzee Rascal and Wiley.