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Carl Maria von Weber wrote his Concertino for Clarinet in E-flat major, Op. 26, J. 109, for clarinettist Heinrich Bärmann in 1811. Weber wrote the work in three days between March 29 and April 3. Bärmann learned the work over the next three days and the command performance, for which King Maximilian I of Bavaria purchased 50 tickets, took place on the evening of April 5. Wikipedia