It's the "New Year Carol" arranged by Benjamin Britten.
"Here we bring new water from the well so clear,
For to worship God with this happy New Year:
[CHORUS] Sing levy dew, sing levy dew, the water and the wine,
With seven bright gold wires, and bugles that do shine.
Sing reign of Fair Maid with gold upon her toe,
Open you the west door and turn the Old Year go;
Sing reign of Fair Maid with gold upon her chin,
Open you the east door and let the New Year in."
Q#1: How is water worshiping God?
Q#2: Who is the Fair Maid? The goddess Aurora?
Q#3: What are the "seven bright gold wires"?
Q#4: What bugles are they singing about?
Q#5: Are there any pagan origins associated with this song?
Q#6: Why does the Fair Maid have gold on randoms parts of her anatomy? Does it have to do with her identity?
If you can answer all or any of these questions, I'd be much obliged. I already know the tradition of boys getting up in the wee hours to sprinkle water on people, so don't tell me that again, please, I've heard it a billion times on Google trying to find the answers to this question.