Where is it? Worthy Farm, Pilton, Somerset
When is it? 25-27 June 2004
Who's gonna be there? Oasis, Muse and ex-Beatle Paul McCartney are headlining. Other top acts are rumoured to include Ms Dynamite, Elbow and Basement Jaxx.
What's it like? Glastonbury is the festival of festivals. Forget posh tents and designer clobber. It's about the music, mud and people in a field.
It dates back to 1970 when farmer Michael Eavis decided to hold a music festival. He still organises it now.
It's had its problems though. Safety rules say only 100,000 people are allowed in the fields, but in 2000, there were about double that number, because loads of people jumped the fences.
Glastonbury was cancelled in 2001 because of the these safety fears. But it came back in 2002, and it's still going strong.