After 18 hours of traditional Glastonbury rain, the sun emerged just as the Sheffield indie rockers the Arctic Monkeys started their set, blasting their new single Do I Wanna Know? to a crowd of about 100,000 from the main Pyramid stage.
"We're going to play all night long Glastonbury. Does that sound good?" yelled frontman Alex Turner to the screaming crowd.
The band was the headline act of a day that started at 11am when Liam Gallagher kicked off three days of music with his band Beady Eye.
Beady Eye's appearance was meant to be a surprise but ended up being one of the worst kept secrets of the 2013 festival after Gallagher was spotted arriving earlier in the week.
Despite vowing never to play at Glastonbury again after criticising the event in 2004, Gallagher played an hour-long set, kicking off with Flick of the Finger and including the crowd-pleasing Morning Glory.
Yesterday's other acts included Sinead O'Connor, Dizzee Rascal, Rita Ora and Bastille.
The year's main act, the Rolling Stones, are playing tonight. Mick Jagger and his girlfriend L'Wren Scott tweeted their arrival on Friday, with Jagger posing outside his yurt .
Mumford & Sons will play the main stage on Sunday.
About 135,000 music fans have paid £205 a ticket to attend the festival that began as a retreat for 1,500 hippies in 1970 who paid one pound and got free milk.
True to Glastonbury's alternative roots, the festival includes music of all genres. This year there are 2,000 acts, including U.S. country star Kenny Rogers, the octogenarian Bruce Forsyth, and chanting monks. Solange Knowles, younger sister to Beyoncé, played one of the smaller stages on Friday.
But not all the performers were so keen on the rural setting - or the 18 hours of rain that temporarily turned the site into a massive mudpit as is tradition at Glastonbury.
British rapper Wiley arrived but quickly turned around and left, apparently abandoning his one-hour DJ-slot on Saturday, tweeting complaints about the weather and his payment.
"Ya know what .. en route to heathrow realtalk .. Lol," he tweeted. "I don't have to play there."
