Columbia subject headings:
Harvard subject headings:
Composers--Germany--Cologne.
Music--Germany--Cologne--20th century--Bio-bibliography--Dictionaries.
Music--Germany--Cologne--20th century--Chronology.
Music--Germany--Cologne--20th century--History and criticism.
Princeton subject headings:
Music--Germany--Cologne--20th century--Bio-bibliography--Dictionaries.
Music--Germany--Cologne--20th century--Chronology.