Columbia subject headings:
Harvard subject headings:
Children's theater--Germany--History--19th century--Congresses.
Children's theater--Germany--History--20th century--Congresses.
Children's theater--Germany--History--Congresses.
Music theater--Germany--History--Congresses.
Musical theater--Germany--History--19th century--Congresses.
Musical theater--Germany--History--20th century--Congresses.
Popular music--Germany--Congresses.
Princeton subject headings:
Children's theater--Germany--History--Congresses.
Music theater--Germany--History--Congresses.
Popular music--Germany--Congresses.