Columbia subject headings:
Beethoven, Ludwig van, 1770-1827. Piano, violin, cello music--Congresses.
Piano trios--Analysis, appreciation--Congresses.
Piano trios--Congresses.
Harvard subject headings:
Beethoven, Ludwig van, 1770-1827. Trios,--Congresses.
Princeton subject headings:
Beethoven, Ludwig van, 1770-1827. Trios,--Congresses.