And here are three contrasting polyphonic versions of Tu Es Petrus. The first is possibly the most famous, by Palestrina.
The second is by one of my favourite modern composers, Maurice Duruflé. The third is by James Macmillan, at the Papal Mass in Westminster Cathedral.
Happy Feast Day!
Tu es Petrus et super hanc petram ædificabo ecclesiam meam et portæ inferi non prævalebunt adversus eam. Et tibi dabo claves regni cælorum.
Thou art Peter and upon this rock, I will build my Church, and the gates of hell will not prevail against her; and I will give you the keys of the kingdom of heaven.
Remember to pray for our Holy Father, Pope Francis today - and every day.