Being the biggest and most famous music festival on the planet, you'd expect that it'd be difficult to keep anything related to Glastonbury under wraps for this long, particularly when it's just over a month until things kick off at Worthy Farm - and you'd be right.
However, although the vast majority of the names on the bill and the finer details have been released to the public, there is still one big 'secret' that organisers are holding back.
Emily Eavis told BBC's Newsbeat: "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.
"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."
She added: "We've had it for about six months."
With Radiohead, Foo Fighters and Ed Sheeran lined up to headline this year's festival from June 21st - 25th, it looks like we'll have to wait just a little longer to find out what - or who - Eavis is talking about.
