His important research work includes "Britannia abundans" (1977), a fundamental study of Anglo-German musical relations at the time of William Shakespeare, "The change of style of music around 1600" (1982), an analysis of the transition from Renaissance music to Baroque music, and "Thöne und Melodeyen, Arien und Canzonetten" (2004), a comprehensive treatise on the German art song in the Baroque era.