Roskilde Festival 2011, held in Denmark from 30 June to 3 July, has released details of four new acts joining the billing.
Dam Funk is set to perform with singer Master Blazter, with fellow American Nicolas Jaar also joining the line-up.
Prince Fatty Soundsystem, originally created as a musical advert for a clothing brand, are set to perform with Little Roy and Horseman.
Shutka Roma Rap complete the new additions, joining Iron Maiden, Kings of Leon and more on the line-up for the four-day festival.
Roskilde Festival tickets are priced at 232 Euros including camping.