Veni Veni Emmanuel is a 12 century hymn sung in latin - the English translation exists and is somewhat more popular but I thought the Latin version will be more in line with our general style. It was arranged for 5 voices by Gleb and the arrangement is inspired by the works of Benjamin Britten. It's kind of a timeline of music where each verse is associated with a specific time. It starts as a monody then proceeds to medieval style, then to classical european harmony and ends in 20th century. I

Four Voices Singing Pure Advent O Come, O Come, Emmanuel Original Latin Text: “Veni, Veni Emmanuel” (12th century or earlier) English Translation: John Mason Neale (1818–1866) Tune: VENI EMMANUEL, adapted from a 15th-century French processional Public Domain: Original recording by Hymnal Harmonizers Hub. Based on a public domain hymn (verified via Hymnary.org). Melody and lyrics are free for public use; no copyrighted material was used. Any resemblance to copyrighted versions is unintentional. ©