Johann Simon Mayr’s music stands on the cusp between the Classical and Romantic eras. The expressive lyrical qualities in his religious music reflects a career in which he composed nearly 70 operas. The Messa solenne follows the Italian tradition of messa concertata and contains the full ordinary – a rarity for Mayr’s output in this genre. The work’s polyphonic sections made an especially lasting impression on churchgoers of the time, as witnessed by Mayr’s first biographer, Girolamo Calvi, who wrote enthusiastically about this work’s ‘exquisite vocal writing’ and ‘profoundly thrilling’ virtuosity – qualities that have remained hidden for nearly 200 years.