Wolfgang Amadeus Mozart's (1756-1791) musical genius was widely acknowledged by his contemporaries and continues to the present time. He is regarded as a master in virtually every musical genre, including operas, symphonies, string quartets, choral works, and concertos. Johann Michael Haydn (1737-1806), the younger brother of Franz Joseph Haydn and one of Mozart's Salzburg contemporaries, was less prolific but also highly esteemed by figures such as E.T.A. Hoffman and Franz Schubert.1 Both Mozart and his father Leopold spoke and wrote of Michael Haydn with admiration and made copies of his sacred works. Indeed, the influence of Haydn on Mozart may be seen in the comparison of Haydn's …