Little Boots came top of BBC Sound 2009 list, which was voted for by critics
Little Boots and Passion Pit are amongst 25 new names confirmed to play this year's Reading and Leeds festivals.
The Horrors, Patrick Wolf and Crystal Castles will also play the NME/Radio 1 Stage at the events, taking place between 28-30 August.
New Found Glory, Madina Lake and Fightstar will take to the main stage.
As previously reported, this year's headliners are Arctic Monkeys, Kings Of Leon and Radiohead.
Other highlights added to the NME/Radio 1 stage include The Airbourne Toxic Event, The Virgins, You Me At Six and Metric.
Delphic, Dinosaur Pile Up, Metronomy and Broadway Calls will also play.