It’s going to be quite a weekend for The Philadelphia Orchestra. On Sunday, September 27, they’ll provide the musical accompaniment for a Mass celebrated by Pope Francis. A solemn assignment to be sure. But the day before, the Orchestra’s crowd-pleasing chops will be on display on a massive stage, treating a huge crowd, both on the Parkway and watching around the world, to their unmatched musicianship. They’ll be teaming up with beloved tenor Andrea Bocelli, Queen of Soul Aretha Franklin, Colombian superstar Juanes, and the Philadelphia Heritage Chorale, led by J. Donald Dumpson.