Fans of Jeff Lynne's Electric Light Orchestra (ELO) will have been left disappointed after finding out they won't get to sing along to Mr Blue Sky below a blue summer sky.
BST Hyde Park has cancelled the final day of its festival after Lynne, 77, withdrew from the band's headline slot at the last minute due to health concerns.
He had been due to front the rock band on Sunday, but stepped back on the advice of his doctors following a "systemic infection", according to a statement released by ELO.
The decision comes just days after the band pulled out of a gig at Manchester's Co-Op Live arena for a similar reason.