Drüner studied music and musicology from 1963 to 1969. After his beginnings with the Stuttgart Chamber Orchestra, he was a viola player in the orchestra of the Stuttgart State Opera. In addition to this career, Drüner founded a music antiquarian bookshop in 1983 and completed his doctorate on Richard Wagner in 1987. The critical examination of this composer, especially from a philosophical and ideological point of view, remained the focus of Drüner's scientific and literary activities in the following decades.
Schöpfer und Zerstörer. Richard Wagner als Künstler.[2] Cologne/Weimar/Vienna 2003, ISBN978-3-4121-7702-7.
Mozarts Große Reise. Sein Durchbruch zum Genie 1777–1779.[3] Böhlau, Cologne/Weimar/Vienna 2006, ISBN978-3-4123-4805-2.
Musik und "Drittes Reich". Fallbeispiele 1910 bis 1960 zu Herkunft, Höhepunkt und Nachwirkungen des Nationalsozialismus in der Musik.[4] Böhlau, Cologne/Weimar/Vienna 2012, ISBN978-3-2057-8616-0.