But when that group hails from Iceland, has six members and a sound that incorporates such instruments as a trumpet and accordion, it is something of a game-changer.Such is the case with Of Monsters And Men, the celebratory sextet that includes Nanna Bryndis Hilmarsdottir (vocals, guitar), Ragnar Raggi Porhallsson (vocals, guitar), Brynjar Leiffson (guitar), Arnar Rosenkranz Hilmarsson (drums), A