Composed by Charles Gounod as a "march" for the 50th anniversary of the Priestly ordination of Pope Pius IX, it was played for the first time on April 11, 1869, by a combination of seven military bands. It was played in the presence of Pope Pius XII in a Christmas ceremony marking the start of the 1950 Holy Year, and it was Pius who then decided that Gounod's work should be adopted as the Papal Hymn (anthem) of the Vatican City-State.
While we heard the tune on the South Lawn today, here are the words:
O happy Rome, O noble Rome:
Seat of Peter, whose blood was shed in Rome,
Peter, to whom the keys of the kingdom of heaven were given.
Pontiff, You are the successor of Peter;
Pontiff, You are the teacher that confirms your brothers;
Pontiff, You who are the Servant of the servants of God, fisher of men, shepherd of the flock, You link heaven and earth.
Pontiff, You are the vicar of Christ on earth, a harbor amidst the waves, You are a beacon in the darkness; You are the defender of peace, You are the guardian of unity, watchful defender of liberty; in You is the authority.
You Pontiff, you are the unshakable rock, and on this rock was built the Church of God.
O happy Rome, O noble Rome.