Puer natus est nobis

"Puer natus est nobis" (A boy is born for us) is a Gregorian chant, the introit for Christmas Day. Thomas Tallis wrote a Christmas mass on the chant.

Text
The text of the antiphon is taken from Isaiah 9:6, while the psalm verse is verse 1 from Psalm 98, "Sing a new song to the Lord". "Puer natus est nobis, et filius datus est nobis : cuius imperium super humerum eius : et vocabitur nomen eius, magni consilii angelus.

Cantate Domino canticum novum : quia mirabilia fecit."

Musical settings
The melody was used by composers in contrafacta such as the Christmas mass by Thomas Tallis.