KT Tunstall was one of the first artists on stage
Scotland's biggest music festival is under way.
T in the Park began on Friday evening and about 180 acts will take to the stage in Balado, Perth and Kinross, before the event ends on Sunday night.
Main stage headliners the Verve, Rage Against the Machine and REM will join the likes of Amy Winehouse, the Fratellis and the Prodigy.
More than 80,000 fans are expected each day and almost 10,000 of them started camping on Thursday.
This is the 15th T in the Park and organiser Geoff Ellis predicted it would be a great event.
He said: "To go from humble beginnings 15 years ago to now being the fastest-selling ticket probably in the world, certainly in the UK, as far as festivals go is very pleasing.
"It's the audience - they're what makes it special and the bands feed off the audience.
"We can book all the great bands in the world, put on great facilities, but if the audience aren't up for it then it doesn't have the same passion and fortunately we've got probably the best festival crowd in the world here."
About 80,000 music fans are expected each day
Last year torrential rain caused traffic chaos at the event. Car parks became water-logged and had to close, leaving long queues on the way to the site.
To help ease traffic congestion this year, the T in the Park campsite was opened a day earlier on Thursday.
And organisers said they were confident there would not be a repeat of 2007's difficulties.
Music fan Jemma Coulan, from Newcastle, said: "I still have the mud on my wellies from last year. I've kept it as a keepsake so I thought I'd bring it back.
"I'm just looking forward to a good festival and seeing The Prodigy on Sunday night, I can't wait for that."
Tania Smiles, of Chester-le-Street, added: "I've never been to T in the Park before. I'm looking forward to see Amy Winehouse. I think she will be really good. But I'm just here for the atmosphere really."
Martin Hailstone, of Bishopbriggs, added: "I'm here to see everyone. There are so many bands I can't remember them all.
"I've been to the festival every year for the last six years and it's brilliant."
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