The performance marked the press launch of "Alma Mater," a CD featuring the recording of the pope leading the "Regina Coeli" prayer in St. Peter's Square on May 1, 2005, the first time he had led the hymn as pope.
The CD features eight pieces. They each begin with six lines from the Marian Litany of Loreto and then segue into a new composition of classical music with the pope's voice overlaid, usually reciting a Marian prayer or talking about Marian devotion.
The disc was co-produced by the Pauline Fathers' Multimedia San Paolo and Geffen Records, which is part of Universal Music Group. It was scheduled for worldwide release Nov. 30.