Christmas Processional (or anthem) for SATB choir and optional bells/chimes. Latin text.
Medieval, chantlike, and mysterious -- capturing the theme of the text well!
O magnum mysterium, et admirabile sacramentum,
ut animalia viderent Dominum natum, jacentem in praesepio!
[O great mystery, and wonderful sacrament,
that animals should see the new-born Lord, lying in a manger!]