The second of the great O antiphons for Advent:
- 17 December: O Sapientia (O Wisdom)
- 18 December: O Adonai
- 19 December: O Radix Jesse (O Root of Jesse)
- 20 December: O Clavis David (O Key of David)
- 21 December: O Oriens (O Dawn of the East)
- 22 December: O Rex Gentium (O King of the Nations)
- 23 December: O Emmanuel
Sir John Tavener was an English composer, known for his extensive output of choral religious works. Among his best known works are The Lamb, The Protecting Veil, and Song for Athene. Tavener first came to prominence with his cantata The Whale, premiered in 1968