Born in Danzig, Blaschke took private singing lessons with Kammersänger Robert Büssel in Dresden. There he experienced the Bombing of Dresden. He studied in Breslau, Warsaw and Sopot. He subsequently worked as a concert singer and singing teacher and gained international renown. His special inclination to promote young talent led him first to Warsaw (assistant to Ada Sari). In 1961, he began teaching at the Hochschule für Musik in Munich, which appointed him full professor in 1975. Until his retirement in 1992, he trained numerous singers who went on to international careers. He was in demand as a leader of master classes and as a juror worldwide until his death.