(Photo: Alia Simoncini) “The Merry Widow,” an operetta in three acts by Franz Lehár with libretto by Victor Léon and Leo Stein, is based on Henri Meilhac’s comedy play “L’Attaché d’ambassade” (1861). The first performance took place in Vienna, Theater an der Wien, on December 30, 1905. The operetta’s newest Italian version production was featured at this season’s Macerata Opera {…}