2018 release. Sonar's fourth release Vortex reflects the sound of surprise. After three uncompromising quartet albums exploring the edges of minimalist groove, the Swiss group has partnered with renowned guitarist, composer and producer David Torn for it's RareNoise debut. The band, comprised of guitarists Stephan Thelen and Bernhard Wagner, bassist Christian Kuntner and drummer Manuel Pasquinelli have long been celebrated for combining the visceral power and dynamics of art rock with a minimalist aesthetic. Their previous album, 2015's Black Light, attracted significant media and musician attention. Legendary avant-guitarist Henry Kaiser took a particular interest in the group and was determined to pair them up with Torn for their next album.