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 today at the 8 and 10 a.m. Masses:
Introit: I am the salvation of the people, says the Lord. Should they cry to me in any distress, I will hear them, and I will be their Lord forever. (Psalm 37:39, 40, 28)
Responsorial psalm: The Lord is near to all who call upon him. (Psalm 145:2-3)
Offertory: If I shall walk in the midst of tribulation, you will give me life, O Lord; and you will stretch forth your hand against the wrath of my enemies; and your right hand shall save me. (Psalm 138:7)
Communion: [10 a.m. Mass] Tu mandasti mandata tua custodiri nimis: utinam dirigantur viae meae, ad custodiendas justificationes tuas.
The above Communion chant is taken from the Church’s “official” songbook, the Roman Gradual. For the 8 a.m. Mass, the cantor will sing an English translation:
You have laid down your precepts to be carefully kept; may my ways be firm in keeping your statutes. (Psalm 119:4-5)