Antiphons are short pieces of music meant to preceded the singing of the Magnificat. during the service of Evening Prayer. The last seven days before Christmas have special antiphons, often called the "O Antiphons", because they all begin with a gasp of wonder. The following link will take you to one of my favorite settings of the Antiphon to Wisdom- by Estonian composer Arvo Part.
O Wisdom, proceeding from the mouth of the Most High,
Thou encirclest the world from one end to the other,
Thou orderest all things with might and mercy:
O come to us and reveal the way of wisdom and of understanding