The first band - rockers The Darkness - took the stage at 10.50am on Friday.
Everyone there hopes they'll need sunglasses
Amazingly there are another 50,000 people expected on the site over the weekend.
They'll be hoping the weather will be good because the whole place can quickly turn into a giant mudpond, with some musicians having dodge flying mud if they're not up to scratch.
Police at Glastonbury say there's been a big drop in reported crime this year compared to last.
Hear story
Adam's 2002 Glasto report
Glasto chat on the non-pop board
I've been to Glasto 8 times!
