The annual string of events held at the central London venue will features 11 performances including one from the BRITs Critics' Choice Award winner, and a closing concert from 'Bang Bang' hitmaker Jessie to end the series of shows on July 19.
Elsewhere on the line-up, 21-year-old singer-songwriter George Ezra, folk band Passenger, Barclaycard Mercury Prize nominee Nick Mulvey will perform, as well as 'Walk' hitmaker Kwabs, who will release his debut album 'Love + War' in May.
Other confirmed headliners include Scottish indie pop band Belle and Sebastian, electro-funk duo Chromeo, guitarist Gary Clark Jr, indie folk duo Angus and Julia Stone, and reggae star Chronixx.
The festival has previously hosted performances by Adele, Ellie Goulding, Jessie Ware and Paloma Faith, while Bastille, Kelis, Sam Smith and Clean Bandit were among acts that featured on the line-up last year.
Tickets for the shows go on sale on Friday (20.03.15).
The full line-up for the Summer Series at Somerset House:
July 9 - Chromeo
July 10 - Gary Clark Jr
July 11 - Passenger
July 12 - Chronixx
July 13 - George Ezra
July 14 - Nick Mulvey
July 15 - Angus And Julia Stone
July 16 - James Bay
July 17 - Kwabs
July 18 - Belle And Sebastian
July 19 - Jessie J
Ahead of their upcoming tour, and prior to the release of their long awaited album, Smoke Fairies played a great warm-up gig at Elsewhere in Margate.