Heinrich Sutermeister (1910-1995) was a Swiss composer.
He composed a Capriccio for solo clarinet (1946) which became a famous contest piece.
Capriccio for solo clarinet (4'51)
Nikolai Rimski-Korsakov (1844-1908) was a Russian composer.
He wrote a concerto for clarinet and military band and two small duets for clarinet in A and Bb.
Duet #1 Canzonetta (0'39)
Duet #2 Tarantella (0'33)
Georg Philipp Telemann (1681-1767) was a German composer.
He was one of the most prolific composers of the history. He wrote for the chalumeau, an ancestor of the clarinet.
Carillon for two chalumeaux (1'18)
Emmanuel Boulanger, clarinet