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.
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.