Thou has made them princes over all the earth... it is the feast of the blessed Apostles Saints Peter and Paul (Introibo). The Introit of the Mass.
And the Gradual.
And the Alleluia.
And the Communion.
I knew that all the parts of the Mass would be easily findable at YT for this feast, ha. Many of the greatest composers have set Tu es Petrus as a motet.
And after Prime I will find Sir James MacMillan's.
The Feast of Saint Peter and Saint Paul celebrates the two pillars of the Church in great solemnity. This feast was already established in the 4th century according to the Chronograph of 354. These great apostles always had a special role for the Benedictines, who chose them as patron saints in many of their abbeys.The antiphon for this Introit is borrowed from the Acts of the Apostles, Chapter 12, verse 11, and describes to us Peter coming to his senses after the ecstasy in which he was plunged when the angel brought him out of prison. It is a cry of admiration and humble gratitude to the Lord who cares for the servants who trust in Him. Psalm 138 recalls the omniscience of God. We hear one of Paul’s letters in the second reading of the Mass. Paul the Apostle’s letters provided the Catholic Church with many of its key doctrines.The mode of this Introit fluctuates between the 3rd and the 4th. The Vatican Edition, like the theorists Réginon or the Abbé Odon, classifies it in the 3rd mode in the same way as the Aquitaine tradition because of the shape (ambitus) of the melody. However, older sources, taking into account the modal characteristics of its incipit, assigned to this Introit the 4th mode.A large number of tropes embellish this chant and they closely follow the dramatic account of the events of the liberation of Saint Peter. In the 11th century, this Introit was introduced to the Benedictine Abbey of Moissac, announcing Saint Peter as patron of his Church with the following verse:“Petri clavigeri kari pangamus triumphum!”
It is also the feast of Saint Trinius (5-6th century), of Saint Cassius of Narni (6th century), and of Saint Emma of Gurk (11th century).
V. Et álibi aliórum plurimórum sanctórum Mártyrum et Confessórum, atque sanctárum Vírginum. R. Deo grátias.