Columbia subject headings:
German drama--21st century--History and criticism--Congresses.
Incidental music--Germany--History and criticism--Congresses.
Incidental music--History and criticism--Congresses.
Theater--History--19th century--Congresses.
Harvard subject headings:
German drama--21st century--Congresses.
Incidental music--19th century--Congresses.
Theater--Germany--21st century--Congresses.
Theater--History--19th century--Congresses.
Princeton subject headings:
German drama--21st century--Congresses.
Incidental music--19th century--Congresses.
Theater--Germany--21st century--Congresses.
Theater--History--19th century--Congresses.