Arnar plays the drums and the accordion in Of Monsters and Men ( band ) .
Of Monsters and Men entered 2010 's Músíktilraunir , an annual music competition held in Iceland , as a quartet with members Nanna ( co-lead vocals , guitar ) , Raggi ( co-lead vocals , guitar , melodica , glockenspiel ) , Brynjar ( guitar , melodica , backing vocals ) , and Arnar ( drums , percussion , melodica , glockenspiel , accordion , backing vocals ) .
Of Monsters and Men