The Advent hymn "O Come, O Come, Emmanuel" is a reworking in English of the seven O Antiphons. It's one of the best-loved English language advent carols. Although few who sing it sing more than the famous 'O Come, O Come, Emmanuel' verse. This recording is perhaps my favourite it's by the Boys Air Choir. The third verse incidentally is sung by Elizabeth Burrowes who as I'm sure you'll agree sings quite as beautifully as her brothers. Enjoy :-).