Francis Jean Marcel Poulenc (January 7, 1899 - January 30, 1963) was a French composer and a member of the French group Les Six. He composed music in genres, including art song, chamber music, oratorio, opera, ballet music, and orchestral music. Critic Claude Rostand, in a July 1950 Paris-Presse article, described Poulenc as "half monk, half delinquent" ("le moine et le voyou"), a tag that was to be attached to his name for the rest of his career.
Latin text
O magnum mysterium,
et admirabile sacramentum,
ut animalia viderent Dominum natum,
jacentem in praesepio!
Beata Virgo, cujus viscera
meruerunt portare
Dominum Christum.
Alleluia.
English translation
O great mystery,
and wonderful sacrament,
that animals should see the new-born Lord,
lying in a manger!
Blessed is the Virgin whose womb
was worthy to bear
Christ the Lord.
Alleluia!
Enjoy :)