BullionVault makes it clear and easy:
John Dowland wrote a lute duet based on the tune, which is perhaps the most well known version.
Several centuries later, I wrote this version for wind, brass and timpani.
The performance is by the Budapest Scoring Orchestra under Péter Pejtsek.
The score is available at Sheetmusicplus
the 8th O Antiphon of Advent.
O Virgin of virgins, how shall this be?
For neither before thee was any like thee, nor shall there be after.
Daughters of Jerusalem, why marvel ye at me?
The thing which ye behold is a divine mystery.
This video provides an electronic preview of the music, while we await live performances near the end of 2017.
Some who know my music may well recognise the origin of the melody....
The Score is available at Sheetmusicplus