Bono's back injury means that U2 has been replaced by the far less comforting letters "TBC" on the Glastonbury website. Speculation on an act to fill this sudden hole at the top of Friday night's bill has fixed on the Rolling Stones.
But the Glastonbury organiser, Michael Eavis, would have to hand over all the festival's profits and more to make the Stones juggernaut roll for a one-off gig. The Red Hot Chili Peppers are hibernating and Paul McCartney and Bob Dylan are booked elsewhere. One wild card could be Neil Young.
It's more likely that Mr Eavis will take comfort from a previous crisis in 1995. Then, a collarbone injury to the Stone Roses' John Squire saw them cannily replaced by a band just starting their rise. Pulp's version of Common People that night made them stars.
Florence and the Machine's Florence Welch, playing the festival's second stage, is my bet to confirm her ascent to the top in U2's place.