A man collapsed and died at the end of the first night of the T in the Park festival, police said today.
Attempts were made by emergency services to resuscitate the man, 24, at about midnight, but he was pronounced dead at the scene.
The man, from the Stonehaven area, had been making his way back from the main area to the campsite when he collapsed.
Tayside Police, who have informed his family, said there were no suspicious circumstances and a report would be sent the procurator fiscal.
The death came as tens of thousands of music lovers get ready to enjoy the sounds of some of the world's top bands on the second day of the festival.
Organisers expect 85,000 people a day to attend the extravaganza in Balado, Kinross-shire over the weekend.
Stereophonics, Mumford and Sons, Vampire Weekend and Paolo Nutini will perform today, with Eminem headlining on the Main Stage.
The line-up also includes The Prodigy, Scouting for Girls and Newton Faulkner.
Tomorrow Kasabian will round off the festival after performances from the likes of Groove Armada, Madness and Dizzee Rascal.
Festival-goers are likely to need wellies and umbrellas today after wet weather was forecast with heavy bursts of rain predicted in the afternoon.
More rain is likely on Sunday but the sun should break through in the afternoon and it is expected to be dry in time for the closing acts of the festival.
Police said they began preparing for this year's festival as soon as the 2009 event finished.
This year the festival has launched the Citizen T initiative for campers, which encourages them to pledge to be a good camping citizen by looking after the area around their tent and that of their neighbours.
Up to 70,000 campers are expected at the event.
Chief Superintendent Craig Suttie, who is in charge of policing T in the Park, said: "In keeping with the Citizen T campaign, we want all revellers to stay safe by looking out for friends and being considerate towards fellow campers and festival goers.
"The festival site is similar to policing a small town and that's why we adopt the same visible and friendly community policing style."
There are 450 officers policing the event, with plain clothes officers and specialist drugs dogs part of the team.
Police said there would be a zero tolerance approach towards illegal drug use within the venue and anyone caught dealing or carrying drugs would be arrested.
By 6pm yesterday 26 arrests had been made, mainly for drug-related offences. More than 100 people had been treated for "minor ailments" in the on-site medical tent, police said.
More than 100 Red Cross volunteers and St Andrew's first aiders will be on duty around the site this weekend.
The Red Cross advised people to stay safe by sticking together with their friends, drinking plenty of water, keeping medication safe and drinking alcohol sensibly.