Underworld and Salem have been added to both legs of Sonar 2011.
They join Magnetic Man on the bill with the festival set to take place at Barcelona from 16-18 June and A Coruña from 17-18 June.
Other names for the Barcelona show include A-Trak, Atmosphere, Hype Williams, Little Dragon, Mary Anne Hobbs and more.
Tickets for Sónar Galicia 2011 are on sale now. Tickets for Sónar Barcelona are still on sale at a special price until the 15 January priced at 130 Euros.
More names to be confirmed in the coming weeks.