Columbia subject headings:
Bonn (Germany)--History.
Music--Germany--Bonn--History and criticism--Congresses.
Harvard subject headings:
Bonn (Germany)--History--18th century--Congresses.
Bonn (Germany)--History--19th century--Congresses.
Bonn (Germany)--History.
Music--Germany--Bonn--18th century--Congresses.
Music--Germany--Bonn--19th century--Congresses.
Music--Germany--Bonn--History and criticism--Congresses.
Princeton subject headings:
Bonn (Germany)--History.
Music--Germany--Bonn--History and criticism--Congresses.