Columbia subject headings:
Harvard subject headings:
German poetry--History and criticism--Congresses.
Music and literature--History--Congresses.
Songs, German--19th century--History and criticism--Congresses.
Songs, German--20th century--History and criticism--Congresses.
Songs, German--History and criticism--Congresses.
Princeton subject headings:
German poetry--History and criticism--Congresses.
Music and literature--History--Congresses.
Songs, German--19th century--History and criticism--Congresses.
Songs, German--20th century--History and criticism--Congresses.