Speculation about the "mystery" headliner for Glastonbury is running at a fever pitch exactly no where in this country. Oh well, I'll take a stab.
Commenters think Prince or Metallica--nope. Neither are big enough anymore. Kate Bush is big enough but I would think that the Glastonbury stage would be too daunting.
Queen are in North America, and playing on June 28. My guess is that Fleetwood Mac will tune up for their tour of North America, which doesn't start until September.
So, yes. It's either Fleetwood Mac or