Scottish music festival T In The Park is expanding to run as a three-day event this summer.

The organizers of the annual event, which has been held as a two-day festival since 1994, have also applied to local authorities to increase its capacity from 75,000 to 80,000. The festival takes place at the disused Balado airfield, near the town of Kinross.

Headlining the 2007 event are Arctic Monkeys (July 6), the Killers and Razorlight (co-headliners on July 7) and Snow Patrol (July 8). Also appearing on the bill are Bloc Party, Lily Allen, Arcade Fire, Scissor Sisters, Amy Winehouse, The View and the Fratellis.

The festival, which became carbon neutral in 2006 by offsetting carbon emissions through involvement in Scottish sustainable forestry projects, will continue its bid to be environmentally friendly in 2007.

"We want to do as much as we can to protect the environment," said Geoff Ellis, CEO of festival organisers Big Day Out Ltd, at a press conference in Glasgow announcing the event. Ellis also revealed that BDO is considering charging a deposit on paper cups and glasses sold at the festival, a common policy at Scandinavian events such as Roskilde.

BDO says 35,000 advance tickets have been sold already, with the rest going on sale at 9 am, Feb. 26. Allocation is limited to two per person.

"We will do what we can to limit touts," Ellis commented. In remarks aimed at a lack of government action against scalping, he continued: "Legislation [against scalpers] already exists for football. Why shouldn't music fans enjoy the same protection?"