The event, named international music festival of the year, has announced a bumper programme of eclectic music acts to celebrate its 20th anniversary.
In 1994, 17,000 people attended the first festival at Strathclyde Park in Lanarkshire. This year organisers expect to welcome 85,000 people on each of the three days between July 12-14 at the site in Balado, Kinross.
Headliners for the main stage this year are Mumford & Sons, Rihanna and The Killers.
The weekend also includes The Script, Chase & Status, Deacon Blue, Dizzee Rascal, Editors, Ocean Colour Scene, Stereophonics and the Yeah Yeah Yeahs.
Homegrown talent also features strongly on this year's line-up, with Emeli Sande, The Fratellis, Frightened Rabbit, Nina Nesbitt, The Proclaimers, Twin Atlantic, The View and CHVRCHES, who are tipped to be rising stars of 2013.
Vodafone VIP customers can also buy tickets 48 hours before they go on general sale from 9am on Wed-nesday, via www.vodafone.co.uk/vip