The St. Cecilia Schola Cantorum has Jubilate Deo available for download in PDF and Word format. What is Jubilate Deo, you ask? Why, it's a product of Vatican II! Didn't anyone tell you?
Pope Paul VI had the Sacred Congregation for Divine Worship issue Jubilate Deo as a "personal gift" to the Catholic Bishops in 1974. It contains the "minimum repertoire of Gregorian chant" for the faithful, in accordance with Sacrosanctum Concilium, the Constitution on the Liturgy from Vatican II (Voluntati Obsequens).
Download it, print it out, read it, study it, learn it, love it! Introduce it to your pastor and your parish's musical director!