The choir sings the following Propers:

  1. Introit or Entrance Hymn
  2. Gradual - sort of corresponds to the Responsorial Psalm
  3. Alleluia
  4. Offertory Antiphon
  5. Communion Antiphon

A very handy place to go to for sheet music for the Propers is Benjamin Bloomfield's Propers Tool where you can select whether to sing the Full Propers or to use Psalm Tones. You can also add in the relevant Chant Ordinaries and Extra Ad Lib Chant!