Note that during Advent, the Gloria is not said or sung (except on the Solemnity of the Immaculate Conception). Also, during Advent we will sing the Sanctus (Holy, holy, holy) and Agnus Dei (Lamb of God) in Latin.
Here are some of the proper texts—those that change with every Sunday or solemnity—to be sung for this Mass:
Introit: O people of Sion, behold, the Lord will come to save the nations, and the Lord will make the glory of his voice heard in the joy of your heart. (based on Isaiah 30:19, 30)
Responsorial psalm: Lord, let us see your kindness and grant us your salvation. (Psalm 85:9-10)
Offertory: Will you not, O God, give us life, and shall not your people rejoice in you? Show us, O Lord, your mercy and grant us your salvation. (Psalm 85:7-8)
Communion: Jerusalem, arise and stand upon the heights, and behold the joy which comes to you from God. (Baruch 5:5, 4:36)
Recessional hymn: On Jordan’s bank (click to download; the pdf will appear in a new tab or window)