Columbia subject headings:
Folk songs, German--History and criticism--Congresses.
Folk songs, Spanish--History and criticism--Congresses.
Germany--Relations--Spain--Congresses.
Music--Germany--19th century--History and criticism--Congresses.
Music--Germany--20th century--History and criticism--Congresses.
Music--Spain--19th century--History and criticism--Congresses.
Music--Spain--20th century--History and criticism--Congresses.
Spain--Relations--Germany--Congresses.
Harvard subject headings:
Folk songs, German--History and criticism--Congresses.
Folk songs, Spanish--History and criticism--Congresses.
Germany--Relations--Spain--Congresses.
Music--Germany--19th century--Congresses.
Music--Germany--19th century--History and criticism--Congresses.
Music--Germany--20th century--Congresses
Music--Germany--20th century--History and criticism--Congresses.
Music--Spain--19th century--Congresses.
Music--Spain--19th century--History and criticism--Congresses.
Music--Spain--20th century--Congresses.
Music--Spain--20th century--History and criticism--Congresses.
Spain--Relations--Germany--Congresses.
Princeton subject headings:
Folk songs, German--History and criticism--Congresses.
Folk songs, Spanish--History and criticism--Congresses.
Germany--Relations--Spain--Congresses.
Music--Germany--19th century--History and criticism--Congresses.
Music--Germany--20th century--History and criticism--Congresses.
Music--Spain--19th century--History and criticism--Congresses.
Music--Spain--20th century--History and criticism--Congresses.
Spain--Relations--Germany--Congresses.