Join Cantemus and artistic director Dr. Mark Francis this Friday, 7:30 PM, at Trinity Cathedral (100 W. Roosevelt St, right off the Roosevelt/Central Ave light rail station) as they take a look into some of Wolfgang Amadeus Mozart’s sacred choral works: the Vesperae solennes de Confessore (KV 339) and the Missa Brevis in C Major (KV 259).   Tickets are $25 for adults and $20 for students and seniors.