Patti Smith managed to make one of the most beloved Christmas hymns all the more exquisite with her gorgeous rendition of 'O Holy Night' at the 2013 Vatican concert. It's little wonder Pope Francis invited the singer back to perform again at this year's show. With the Vatican orchestra playing back up, Smith's voice resonated throughout the Conciliation Auditorium in Rome, where the 2014 concert will also take place on Dec.