His music shows a variety of modernist influences, from Webern to Ligeti, which seem well-integrated into an assured personal style, a hallmark of which is an insistent, often repetitive rhythmic impulse. In the trio 'Kisum,' he evokes nature through unconventional techniques, having the players blow, tap and scrape their instruments to produce odd, almost electronic sounding squeals and growls. The two quartet pieces show Sigurbjornsson moving from austere post-war