Columbia subject headings:
Composers--Germany--Congresses.
Pianists--Germany--Congresses.
Schnabel, Artur, 1882-1951--Congresses.
Harvard subject headings:
Composers--Germany--Congresses.
Pianists--Germany--Congresses.
Schnabel, Artur, 1882-1951--Congresses.
Princeton subject headings:
Composers--Germany--Congresses.
Pianists--Germany--Congresses.
Schnabel, Artur, 1882-1951--Congresses.