In 2003, guitarist Raoul Björkenheim and drummer Lukas Ligeti released a set of evocative duets under the album title Shadowglow (TUM). The Finnish-American Björkenheim and the Austrian-born Ligeti, the son of celebrated modern composer György Ligeti, both made their mark on the New York improvisational music scene. They were a formidable team, their dark, propulsive music spanning various cultures and genres,...