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After a painstakingly and seemingly never-ending wait, Glastonbury announced their line-up last week. Well, most of it - they still have hundreds of artists to be revealed - including their Saturday night headliner. The missing name from the top of the bill and the reasons from leaving it out has sparked a whole bunch of online conspiracy theories about who could be taking to the Pyramid Stage on Saturday night this June.
From overly optimistic hopes, to tenuous links in artwork, to bookies' odds to contractual wranglings and other festival bookings, we've had a look around for seven of the most likely and tantalising theories about who it could be.
Radiohead? Prince? Metallica? Foo Fighters? Fleetwood Mac? We just don't know yet - but chances are that it could well be one of these seven artists.