There are three days within the year when, instead of praying the Gloria/Glory be, we substitute another vocal prayer more in keeping with the season.
On Holy Thursday:
V. Christus factus est pro nobis.
R. Obœdiens usque ad mortem.
V. Christ became obedient for us.
R. Obedient unto death.
In doing the Traditional Visita Iglesia, for example, one custom is to visit 7 churches and pray, in front of the Altar of Repose, 6 sets of Our Father…. Hail Mary…. Christ became obedient… followed by a Spiritual Communion such as the one popularized by St. Josemaría Escrivá : “I wish, Lord, to receive You with the purity, humility and devotion with which Your most holy Mother received You, with the spirit and fervor of the saints.”
On Good Friday:
V. Christus factus est pro nobis obœdiens usque ad mortem.
R. Mortem autem crucis.
V. Christ became obedient for us unto death.
R. Even to death on a cross.
One may use this prayer when doing the Way of the Cross instead of the Glory Be.
On Black Saturday:
V. Christus factus est pro nobis obœdiens usque ad mortem, mortem autem crucis.
R. Propter quod et Deus exaltávit illum: et dedit illi nomen, quod est super omne nomen.
V. Christ became obedient for us unto death, even to death on a cross.
R. For which cause, God also has exalted him and has given him a name which is above all names.
On all three days, it is recommended in the Roman Missal that the above prayers be said instead of Gloria/Glory Be when saying one’s daily Holy Rosary.