Kings Of Leon and chart duo Rizzle Kicks are among the latest headline acts added to this year's iTunes Festival.
They are among the 60-plus acts who will be performing throughout September at London's Roundhouse for the free series of events.
Also newly added to the bill for the series of free concerts, which will be available online, are Sigur Ros, Paramore and Vampire Weekend, while composer Ludovico Einaudi will also headline.
They join the likes of Justin Timberlake, Jessie J and Queens Of The Stone Age who were announced last month.
Others are to be announced over the coming weeks.
Rockers Kings Of Leon - more used to playing arenas and major outdoor events - said of their forthcoming show on September 11: "It's always been something we've wanted to do."
Fans can apply for free tickets at itunes.com/festival.