Columbia subject headings:
Music--Austria--History and criticism.
Music--Germany--History and criticism.
Organ music--History and criticism.
Harvard subject headings:
Music--Austria--Congresses.
Music--Germany, Southern--Congresses.
Organ music--Congresses.
Princeton subject headings:
Music--Austria--Congresses.
Music--Germany, Southern--Congresses.
Organ music--Congresses.