The surprise release arrives after John's history-making headline set on the Pyramid Stage at Glastonbury this weekend
Rumours had been swirling about the singer making her first appearance in five years as part of Elton's set on Sunday night
Sir Elton celebrates the past, present and future of music on his last ever UK show
"He was my friend, an inspiration, and today would have been his 60th birthday"
"I want to thank you all for showing up in your costumes and your glasses and your outfits"
Fans are describing it as "the best Glastonbury set ever"
"He was the first person I thought of to ask to come and sing with me, even though he’s played Glastonbury six times with The Killers"
Rumours are rife that Britney will join Elton John on stage later
The news was announced by his husband
The 'Rocket Man' singer will be bringing "four collaborators of his choosing" on stage at Glastonbury this weekend