Columbia subject headings:
Music--Europe--20th century--History and criticism--Congresses.
Musicology--Europe--History--20th century--Congresses.
Harvard subject headings:
Music--Europe--20th century--History and criticism--Congresses.
Musicology--Europe--History--20th century--Congresses.
Princeton subject headings:
Music--Europe--20th century--History and criticism--Congresses.
Musicology--Europe--History--20th century--Congresses.