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.

Glastonbury 2017 full line-up

Radiohead

Foo Fighters

Ed Sheeran

Alison Moyet

The xx

The National

Biffy Clyro

Katy Perry

Barry Gibb

Royal Blood

Stormzy

Chic

Major Lazer

Alt-J

Boy Better Know

Lorde

Solange

Run the Jewels

Laura Marling

Kris Kristofferson

The Jacksons

Emeli Sandé

Phoenix

First Aid Kit

Justice

Aanderson .Paak and the Free Nationals

Haim

Toots and the Maytals

Father John Misty

The Flaming Lips

Dizzee Rascal

Warpaint

BadBadNotGood

Metronomy

Annie Mac

Kano

Goldfrapp

Sleaford Mods

Kate Tempest

Wiley

Dynamo

The Can Project

Thundercat

The Avalanches

Clean Bandit

George Ezra

Glass Animals

The Courteeners

Sampha

DJ Shadow

London Grammar

Ride

Songhoy Blues

Little Dragon

Kaiser Chiefs

Wild Beasts

Angel Olsen

The Lemon Twigs

Nines

Moderat

Rag'n'Bone Man

Craig David

Circa Waves

Future Islands

Ani DiFranco

Nadia Rose

Shaggy

British Sea Power

Mark Lanegan

The Moonlandingz

Frank Carter and the Rattlesnakes

Temples

Halsey

The Cinematic Orchestra

Tove Lo

Sasha and John Digweed

Joe Goddard

Boys Noize

Kurupt FM

Noisia

Declan McKenna

Loyle Carner

Lisa Hannigan

Birdy

Martha Wainwright

All We Are

Girl Ray