At every Mass we sing or say the words of the Ordinary (the unchangeable parts of the Mass), for example, the Gloria; Holy, holy, holy; and Lamb of God.
The Mass also includes what are called the propers—texts that change for each Sunday and solemnity. These include the introit (entrance chant), the responsorial psalm, the offertory chant, and the Communion chant.
Here are the proper texts to be sung on October 18, the 29th Sunday in ordinary time, at the 8 and 10 a.m. Masses:
Introit: To you I call; for you will surely heed me, O God; turn your ear to me; hear my words. Guard me, O Lord, as the apple of your eye; in the shadow of your wings protect me. (Psalm 17:6,8)
Responsorial psalm: Give the Lord glory and honor. (Psalm 96:7)
Offertory: I will meditate on your commandments, which I have loved exceedingly, and I shall lift up my hands to your commandments, which I have loved. (Psalm 119:47-48)
Communion at the 8 a.m. Mass: Behold, the eyes of the Lord are on those who fear him, who hope in his merciful love, to rescue their souls from death, to keep them alive in famine. (Psalm 33:18-19)
Communion at the 10 a.m. Mass: Domine Dominus noster, quam admirabile est nomen tuum in universa terra! (Psalm 8:2)
English translation: O Lord, our Lord, how admirable is your name in all the earth! (Psalm 8:2)
The recessional hymn for the 10 a.m. Mass will be All creatures of our God and king.