Mozart's friendship with Anton Stadler, the clarinetist in Vienna's Royal-Imperial Court Orchestra, led to the composition of Mozart's
Clarinet Quintet In A Major.
The four-movement piece is arranged for Clarinet, two Violins, Viola, and Violoncello.
Brahms's Clarinet Quintet in B minor, also in four movements, is equally popular and often recorded with Mozart's work.