Responsory

Mozarabic Missal calls the Responsory that comes at this point the

The Catholic Encyclopedia, Volume 6: Fathers of the Church-Gregory XI 1840-1916 1913

When the Hymn is done, the subdeacon knocks on the doors of the church with the staff of the processional Cross; the two cantors open the doors at once, and everyone enters the church, while the Responsory Ingrediente Domino is sung.

Compendium of the 1955 Holy Week Revisions of Pius XII: Part 1 - The Palm Sunday Blessing and Procession of Palms 2009

(A similar ritual is performed at the procession of Candlemas, for which the Missal appoints two processional antiphons, and a Responsory to be sung when the procession enters the church.)

Compendium of the 1955 Holy Week Revisions of Pius XII: Part 1 - The Palm Sunday Blessing and Procession of Palms 2009

EDIT: I notice the video itself says this "Responsoria Settimana Santa," which I'm told means "Responsory for Holy Week."

A wonderful YouTube chant resource bls 2009

It returns at regular intervals – in the Gradual, the Sanctus and Agnus Dei, through the promise of perpetual light in the Communion – but is interrupted in the Offertory and the Responsory by the thought of what will happen if Christ does not deliver the departed soul from the pains of hell.

Archive 2009-03-01 Lu 2009

EDIT: I notice the video itself says this "Responsoria Settimana Santa," which I'm told means "Responsory for Holy Week."

Archive 2009-01-01 bls 2009

The final Responsory, to different words, again sees a reduction to four voices.

Archive 2009-03-01 Lu 2009

But in both the Offertory and the Responsory calm is restored by the idea of light: ‘let Saint Michael bring them forth into Thy holy light’ in the Offertory, and ‘lux perpetua’ ‘light perpetual’ in the Responsory.

Archive 2009-03-01 Lu 2009

Indeed the Responsory represents a mini-drama within the whole, piling agony on agony as the pace of the music quickens by alternating brief chant passages with abbreviated polyphony.

Archive 2009-03-01 Lu 2009

Here is a page of Responsory verses from that Cathedral.

Archive 2007-12-01 bls 2007