This is a completely re-typeset version of Pope Paul VI's "Jubilate Deo". It is a collection of the simpler Gregorian chant melodies for the faithful to sing together. In this way Gregorian chant may again become a bond that forms the members of many nations into a single people, gathered together in Christ's name with one heart, one mind, and one voice. This living unity, symbolized by the union of voices that speak in different languages, accents, and inflections is a striking manifestation of the diversified harmony of the one Church.