Metallica have requested a Glastonbury slot every year.
The heavy metal band will make history by headlining the Pyramid Stage on Saturday night - June 28 - and have apparently been asking to perform at the Worthy Farm musical extravaganza for years.
Festival founder Michael Eavis told The Guardian newspaper: "I have to see what Metallica do. Metallica have been trying to play for so long - they ring every year, and they're so polite about it. 'We'd love to be there, we're getting older, can we play it now?'
"That sort of thing. The least I can do is to watch them."
Metallica have received mixed responses from music-lovers about their addition to the line-up alongside Kasabian and Arcade Fire, but guitarist Kirk Hammett is unfazed and joked he didn't realise it was such a big deal since he thought they had already played the festival.
Kirk explained to NME magazine: "It's entertaining to watch the media circus fret over our little band. I've just been kicking back and enjoying it, because frankly - I thought we already played Glastonbury!
I thought we did it with System Of A Down back in 2004 or something. I mistook it for a gig we played in Ireland. But when the initial offer came, I said to our management, 'Glastonbury, we've played it before!'"
Tagged in Kasabian Metallica Michael Eavis