Puer natus est nobis
"Puer natus est nobis" 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".The melody was used by composers in contrafacta such as the Christmas mass by Thomas Tallis.In the Babylon 5 episode There All the Honor Lies, the song is sung for Captain Sheridan, as "One Moment of Perfect Beauty".