'Give Your Heart a Break' was performed by Demi Lovato on the Honda Stage during the Vivo Certified SuperFanFest.
The singer introduced "the next generation" in Iceland.
Jack Antonoff hears a ''female voice'' in his head when he writes music.
The show will be seen by everybody at the same time.
The Scottish comedian has been speaking about gaining a knighthood in the Queen's Birthday Honours List.