Today is the first Sunday in Advent.
Arvo Pärt: O Adonai
Zero8 Chorus

From the YouTube page:
Today we continue celebrating advent with one if the Great Advent Antiphons, O Adonai. Much like O Emmanuel, or Veni Emmanuel as many of us know it by, it celebrates the coming of the Lord. This version in German was composed by Arvo Pärt.
Please enjoy!