SATB a cappella with lots of SA divisi. Latin text.
Atmospheric, mysterious, chantlike, and enchantingly beautiful. Free rhythm throughout.
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!]