The Beginning of Advent: Veni, Veni Emmanuel

With the beginning of Advent with 1st Vespers this evening in the Roman rite (it is worth recalling that in traditions such as the Ambrosian rite, Advent has 6 weeks and thus began 2 weeks ago), it seems fitting to mark our shift into this season with an Advent hymn, "Veni, Veni Emmanuel" -- a hymn that is based upon the famous Advent "O" Antiphons.