Columbia subject headings:
Harvard subject headings:
Composition (Music)--History--20th century--Congresses.
Music--20th century--History and criticism--Congresses.
Music--Editing--Congresses.
Musical notation--History--20th century--Congresses.
Princeton subject headings:
Composition (Music)--History--20th century--Congresses.
Music--20th century--History and criticism--Congresses.
Music--Editing--Congresses.
Musical notation--History--20th century--Congresses.