Gaudeamus omnes in Domino (Let us all rejoice in the Lord) is the Introit chant for the Mass on the Feast of All Saints.
Dom Guéranger explains:
“The Introit Antiphon resembles that of Our Lady’s Assumption Day. This feast is indeed a sequel to Mary’s triumph. As Our Lord’s Ascension called for His Mother’s Assumption, both required for their completion the universal glorification of the human race, which provides Heaven with its King and Queen.
“Joy, then, on earth which continues thus magnificently to give its fruit! Joy among the Angels, who see their vacant thrones filled up! Joy, says the verse, to all the Blessed who are receiving the congratulations of Heaven and Earth!” (1)
Gaudeamus omnes in Domino is here interpreted by Pro-Arte St. Louis.
Listen to Gaudeamus omnes in Domino
Ant. Gaudeamus omnes in Domino,
Diem festum celebrantes
Sub honore Sanctorum omnium:
De quorum solemnitate
Et collaudant Filium Dei.
V. Exsultate justi in Domino:
Rectos decet collaudatio.
Ant. Let us all rejoice in the Lord
Celebrating the feast
In honor of all the Saints,
In which solemnity
The Angels rejoice,
And praise the Son of God.
V. Rejoice in the Lord, O you just;
Praise befits the upright