Palm Sunday is a privileged semi-double Sunday. It is the sixth Sunday in Lent and the beginning of Great or Holy Week.
Before Mattins the festive array for the feast of the Annunciation was removed and the altars vested in violet. At Mattins, as last week and daily until the Triduum, the invitatory is Hodie, si vocem Domini audieritis, Nolite obdurare corda vestra from Ps. 94 and a special rubric indicates the omission of that verse in the psalm. The hymn is Pange, lingua. The antiphons given in the Psalter for Sundays are used. As usual Mattins has three nocturns and nine lessons. In the first nocturn psalms 1, 2, 3, 6, 7, 8, 9, 10, 11, 12, 13 & 14 are sung. The lessons in the first nocturn are from the book of Jeremiah. These are the same, as are their responsories, as those found in the post-Clement editions of the Breviary. In the second nocturn psalms 15, 16 and 17 are sung and the lessons are from a sermon on the Passion by St. Leo. The fifth lesson begins with the words Qui ut humanum genus and incorportates what is now the sixth lesson from Fefellit ergo illum.. until famulatae sunt Redemptori. The sixth lesson, Quod ergo...justitiae esse propositum is not found in the 'modern' Breviary. In the third nocturn psalms 18, 19 & 20 are sung and the lessons are a homily of St. Ambrose, their arrangement is slightly different to that found in the modern books. The Te Deum is omitted as on other Lenten Sundays and a ninth responsory, Circumderunt me viri mendaces..., sung in its place.
At Lauds the antiphons are proper to Palm Sunday, Dominus Deusetc, and sung with Pss. 50, 117, 62-66, Benedicite, 148-149-150. The hymn is Lustra sex. The versicle after the hymn Eripe me, chapter, antiphon on the Benedictus and collect are proper to the Sunday.
At Prime the order of psalmody is Pss. 53, 92, 118(i), 118(ii) and Quicumque, the 'Athanasian' Creed. The Dominical preces are sung. At all the Hours the antiphons and chapters are proper.
The Asperges, the magnificent Blessing and Procession of Palms and Mass takes place after Terce. The ministers wear violet folded chasubles. After the Asperges the celebrant and ministers proceed to the Epistle corner and begin the solemn blessing of Palms whilst the choir sing the antiphon Hosanna fili David, O Rex Israel etc. The rubrics give a direction that the Palms to be blessed at the Epistle side. The blessing begins with the celebrant reading the antiphon Hosanna Filio David followed by a collect Deus, quim diligere and then the reading of an Epistle and Gospel. The normal ceremonies of High Mass are followed. The subdeacon removes his folded chasuble to sing the Epistle taken from the Book of Exodus. Following the Epistle two texts are given, Collegerunt pontifices and In monte Oliveti (the latter will appear again as a responsory during the Triduum) to be sung as a 'gradual', both may be sung. Following the Gospel the deacon resumes his folded chasuble and the collect Auge fidem is sung followed by a preface, Sanctus and four further collects Deus, qui dispersa, Deus, qui miro, Deus, qui per olivae and Benedic quaesumus. The presence of a preface is indicative of the solemn blessing (c.f. the great blessing of waters at Epiphany). The collect Deus, qui miro is a didactic masterpiece. Readers will note the strong correlation between the text of the collect and of the second lesson of Mattins for the Saturday before Palm Sunday from St. Augustine:
O God, who, by the wonderful order of Thy disposition, hast been pleased to manifest the dispensation of our salvation even from things insensible: grant, we beseech Thee, that the devout hearts of Thy faithful may understand to their benefit what is mystically signified by the fact that on this day the multitude, taught by a heavenly illumination, went forth to meet their Redeemer, and strewed branches of palms and olive at His feet. The branches of palms, therefore, represent His triumphs over the prince of death; and the branches of olive proclaim, in a manner, the coming of a spiritual unction. For that pious multitude understood that these things were then prefigured; that our Redeemer, compassionating human miseries, was about to fight with the prince of death for the life of the whole world, and, by dying, to triumph. For which cause they dutifully ministered such things as signified in Him the triumphs of victory and the richness of mercy. And we also, with full faith, retaining this as done and signified, humbly beseech Thee, O holy Lord, Father almighty, everlasting God, through the same Jesus Christ our Lord, that in Him and through Him, whose members Thou hast been pleased to make us, we may become victorious over the empire of death, and may deserve to be partakers of His glorious Resurrection.
The celebrant then puts on incense and blesses it. The Palms are then aspersed with lustral water, the celebrant saying in a low voice Asperges me etc, and then censed. Another collect, Deus, qui Filium is then sung. The celebrant then receives his Palm from the senior canon present. If no other priest is present the celebrant kneels and takes the Palm from the of the altar, kisses it then passes it to the subdeacon who places it again on the mensa. The celebrant then gives Palms to the deacon and subdeacon and other ministers and then the people. The Palm is kissed first and then the celebrant's hand. During the distribution the antiphons Pueri Hebraeorum and Pueri Hebraeorum vestimenta are sung. After the distribution the celebrant and ministers go back to the altar, bow to the Cross and then go to the Epistle corner where the celebrant's hands are washed. Then, at the missal, he sings the collect Omnipotens sempiterne.
Holy Week has inspired many great musical compositions. An example of one of the finest for Palm Sunday is Victoria's Pueri Hebraeorum vestimenta, a period piece for the Tridentine rite from Victoria's Holy Week book of 1585.
The celebrant's hands are washed after the distribution of Palms whilst the Processional Cross is decorated with the blessed Palms. A Procession is then formed, led by the thurifer, followed by the subdeacon (of the Mass, not this day an additional subdeacon) bearing the Processional Cross. The deacon sings Procedamus in pace and the following antiphons are sung during the Procession Cum appropinquaret, Cum audisset, Ante sex dies, Occurrunt turbae, Cum angelis et pueris and Turba multa. Ideally, the Procession goes outside and around the church. Often circumstances dictate the Procession must simply go around the aisles of the church. Towards he end of the Procession cantors re-enter the church and the door is closed. The beautiful hymn of Theodolph Gloria, laus, et honor is then sung in alternation between the cantors inside the church and everyone else outside. At the end of the hymn the subdeacon strikes the church door three times with the foot of the Processional Cross and the party re-enters the church to the singing of Ingrediente Domino.
Mass then follows the usual manner. The celebrant removes his cope and dons his chasuble. The preparatory prayers are said but the psalm Judica me is omitted being in Passiontide. The introit is Domine, ne longe etc. There is no Gloria. No commemoration is made of an occuring Office on Palm Sunday so there is only one collect. Psalm 21 is sung in its entirety as a Tract. The major difference from any other Sunday is singing of the Passion according to St. Matthew by three additional deacons of the Passion. The text of the Passion is Matthew 26: 1-75; 27: 1-66. After the singing of the Passion the last part, Altera autem die...lapidem cum custodibus, is sung with the ceremonies of a Gospel by the deacon of the Mass (having removed his folded chasuble etc). The choir and people hold their Palms during the singing of the Passion. The Creed is sung, the preface is of the Cross and the dismissal is Benedicamus Domino sung by the deacon facing the celebrant and altar.
Vespers are of the Sunday. At Compline the Dominical preces are sung. The additional Offices of the Little Office of the BVM, the Office of the Dead, the Gradual Psalms and the Penitential Psalms and Litany are omitted in Great Week.