Columbia subject headings:
Beethoven, Ludwig van, 1770-1827. Cello, piano music--Congresses.
Cello and piano music--Congresses.
Harvard subject headings:
Beethoven, Ludwig van, 1770-1827. Cello, piano music--Congresses.
Cello and piano music--Congresses.
Princeton subject headings:
Beethoven, Ludwig van, 1770-1827. Cello, piano music.