Columbia subject headings:
Popular music radio stations--Germany--History--Congresses.
Radio and music--Germany--History--Congresses.
Radio programs, Musical--Germany--History--Congresses.
Harvard subject headings:
Radio and music--Germany--History--20th century--Congresses.
Radio broadcasting, German--History--20th century--Congresses.
Radio music--Germany--History--20th century--Congresses.
Radio programs--Germany--History--20th century--Congresses.
Princeton subject headings: