Columbia subject headings:
Music--20th century--Congresses.
Music--21st century--Congresses.
Nature in music--Congresses.
Harvard subject headings:
Music--20th century--History and criticism--Congresses.
Music--21st century--History and criticism--Congresses.
Nature in music--Congresses.
Princeton subject headings:
Music--20th century--History and criticism--Congresses.
Music--21st century--History and criticism--Congresses.
Nature in music--Congresses.