German clarinettist Richard Mühlfeld (1856 – 1907) must have been one hell of a player. His artistry nudged a semi retired Brahms to write the seminal chamber work for the instrument, the Clarinet Quintet (1891), a fine trio and the two most famous sonatas for the instrument.
The same could be said for Austrian clarinettist Anton Stadler (1753 – 1812). His playing inspired Mozart to write an equally wonderful Clarinet Quintet (1789) and the instrument’s greatest Concerto (1791).