The director of the Sistine Chapel Choir, Monsignor Massimo Paolombella talks during an interview with The Associated Press, in Rome, Monday, June 25, 2012. The Westminster Abbey Choir, the world-renown chorus which last year performed at the wedding of Prince William and Kate Middleton, will join the Sistine singers at a special papal Mass on Friday in St. Peter's Basilica, a historic event seen as a perfect symbol of Christian harmony _ after centuries of discord. It's the first time in its 500-plus year history that the pope's personal choir will be accompanied by another chorus, let alone one that comes from the breakaway Anglican Church. (AP Photo/Andrew Medichini)