U.K. rock band the Enemy and British alt-rock act Bat For Lashes have joined the line-up for the open-air Summer Series of concerts at London's Somerset House.

The Enemy perform on July 10, promoting sophomore set "Music For The People" (Warner Bros). Bat For Lashes' Natasha Khan and her live band will be performing songs from her second album "Two Suns" (Parlophone) on July 16.

U.S. alt-rock band the Mars Volta will also play the event on July 13.

Other acts already confirmed for the Summer Series, promoted by Metropolis, include Grace Jones, Pendulum, Athlete, Lily Allen and the Ting Tings.

Somerset House has hosted its open-air summer concerts since 2003, featuring acts such as Bloc Party, Amy Winehouse, Duffy, Adele and the Prodigy.