Columbia subject headings:
Harvard subject headings:
Buchholz, Helen, 1877-1953--Congresses.
Composers--Luxembourg--Congresses.
Koster, Lou, 1889-1973--Congresses.
Music--Luxembourg--History and criticism--Congresses.
Princeton subject headings:
Buchholtz, Helen, 1877-1953--Congresses.
Koster, Lou, 1889-1973--Congresses.
Music--Luxembourg--History and criticism--Congresses.
Women composers--Luxembourg--Congresses.