Columbia subject headings:
Music--Germany--History and criticism.
Organ music--History and criticism.
Organists--Germany.
Harvard subject headings:
Organists--Germany.
Princeton subject headings:
Music--Social aspects.
Organ music--Germany (West)--History and criticism.
Organists--Germany (West)--Hamburg--Biography.
Organists--Germany (West)--Schleswig-Holstein--Biography.