Janelle Monae, more for Oyafestivalen 2011
Lykke Li, Hakan Hellstrom and Tog added
Chris Eustace - 14 February 2011
Both will play their only Norwegian dates this summer at the event, while Hakan Hellstrom and Tog have also just been announced to play.
They join the likes of Pulp, Fleet Foxes, Bring Me The Horizon and Warpaint at Middelalderparken, Oslo, from 10-14 August.
Weekend passes are available now for 1995 NOK, and day tickets are on sale for 665 NOK.