Columbia subject headings:
Church music--Germany--20th century--Exhibitions.
Church musicians--Germany--North Rhine-Westphalia--Exhibitions.
Ehmann, Wilhelm--Exhibitions.
Harvard subject headings:
Conductors (Music)--Germany--Biography
Ehmann, Wilhelm.
Musicologists--Germany--Biography.
Princeton subject headings:
Conductors (Music)--Germany--Biography.
Ehmann, Wilhelm.
Musicologists--Germany--Biography.