Short answers, pulled from the story.
Wolfgang Amadeus Mozart completed the Clarinet Concerto in A major during October of 1791. The work stands as his final major composition before his death later that same year.
Mozart wrote the piece specifically for Anton Stadler, a close friend and virtuoso clarinettist. Stadler co-invented the basset clarinet to play lower notes than standard models.
The typical performance lasts approximately 29 minutes. The opening Allegro movement spans bars one through 359 while the second Adagio movement uses rounded binary form.
Hans Rudolf Stalder made the first recording using a reconstructed basset clarinet in September 1968 with the Cologne Chamber Orchestra. He used a modern Boehm instrument built by F. Arthur Uebel factory in Markneukirchen, Saxony.
The concerto contains three movements including an opening Allegro in sonata form, a middle Adagio in rounded binary form, and a final Rondo blending sonata and rondo forms. The structure follows an A, B, A, C, A, B, A pattern for the finale.