Datarock are among the latest trio of names confirmed for this year's Oya Festivalen.
Metallers Rise Against and US group Grizzly Bear will also head over to Norway for the five-day event.
Today's confirmations join a line-up that already boasts Arctic Monkeys, Lily Allen, Royskopp, Bon Iver and more.
Oya Festival 2009 will take place at Middelalderparken, Oslo in Norway from 11-15 August.
Four-day passes are already available priced at NOK 1,850. Day tickets are yet to go on sale.
Oya has three stages of music as well as boasting an incredible selection of good food prepared exclusively by Oslo's best up and coming chefs.
The festival also prides itself on being environmentally sound and encourages and a host of actions to ensure that the site is left intact as well as implementing one of Europe's most effective waste disposal systems.
As a city festival there is no camping available at the festival but a campsite near the event as well as numerous hostels and hotels are at hand to welcome European festival-goers.