One of clarinet history’s greatest mysteries is the whereabouts of the manuscript to Mozart’s beloved Concerto for Clarinet in A Major, K. 622, written in 1791 for Anton Stadler. We know that Mozart gave his fellow freemason friend Anton Stadler the manuscript of his new concerto on October 10, 1791 (only two days after he finished orchestrating the piece), along with 200 florins for “travel money” before Stadler embarked on what would become a five-year tour of Eastern Europe. (By the way, 200 florins might not sound like much, but it was the equivalent to a quarter of Mozart’s salary as a Viennese court composer.) Stadler began his tour with…