Columbia subject headings:
Radio and music--Europe--History--20th century--Congresses.
Radio and music--Italy--History--20th century--Congresses.
Radio music--20th century--History and criticism--Congresses.
Radio music--20th century--Political aspects--Congresses.
Radio music--20th century--Social aspects--Congresses.
Harvard subject headings:
Radio and music--Europe--History--20th century--Congresses.
Radio and music--Italy--History--20th century--Congresses.
Radio music--20th century--History and criticism--Congresses.
Radio music--20th century--Political aspects--Congresses.
Radio music--20th century--Social aspects--Congresses.
Princeton subject headings:
Europe--Social life and customs--20th century--Congresses.
Radio and music--Europe--History--20th century--Congresses.
Radio broadcasting--Europe--History--20th century--Congresses.