" But Christianity has always understood that the speech of angels is actually song, in which all the glory of the great joy that they proclaim becomes tangibly present. And so, from that moment, the angels’ song of praise has never gone silent. It continues down the centuries in constantly new forms and it resounds ever anew at the celebration of Jesus’ birth. It is only natural that simple believers would then hear the shepherds singing too, and to this day they join in their caroling on the Holy Night, proclaiming in song the great joy that, from then until the end of time, is bestowed on all people. "

― Benedict XVI , Jesus of Nazareth: The Infancy Narratives