Sacred Music at St. Mary’s Learning to Sing the Mass: Practicing the Missa Orbis Factor We invite every parishioner to begin practicing this beautiful Gregorian chant setting of the Ordinary of the Mass, so that we may pray and sing together more fully at the Sacred Liturgy. Beginning Sunday, June 21 We intend to begin using the Missa Orbis Factor at the 9:30 AM Mass on Sunday, June 21. Please take time to listen, practice,