Drone Mass In memoriam: Jóhann Jóhannsson  Monday June 18, 20.30, Stavros Niarchos Hall, GNO The famous Drone Mass, a 60-minute contemporary oratorio which fuses the sounds of string quartet, electronics and vocals, comes to SNFestival 2018. It’s a musical composition of the late Icelandic composer Jóhann Jóhannsson (twice a candidate for the Academy Award for Best...