Darmstädter Ferienkurse
Although he had begun to compose at the age of 17, Fritsch regards as his first real composition the "Duett für Bratsche" (Duet for Viola), for viola and tape, which had a "succès de scandale" when he performed it at the Darmstädter Ferienkurse in 1962—one newspaper review called him a "kühner Kratzer" (audacious scraper).