Clarinet trio

A clarinet trio is a chamber ensemble that consists of a clarinet, a bowed string instrument and a piano, or a musical work for such an ensemble. The string instrument can be a cello, a viola, or a violin. Therefore, a clarinet trio can be referred to below:
Notable works for clarinet trio.
Ludwig van Beethoven.
The clarinet part of both works by Beethoven can be and is often substituted with a violin.