Copper Halfpenny

Puzzle Solvers – Please Help!?
The answer needs to be the title of a Carol or Christmas Song. I have only the number of letters in each word – nothing else.
CLUE: Copper coin, flexible twig, being joyful (2,4,8)
I’m thinking that the only copper coins were the farthing and the halfpenny (ha’penny) and the flexible twig could be willow, but as I’m not getting anywhere with those, I’m probably way off. Any help would be much appreciated.
Wow, Beth, I wouldn’t have guessed that one in a million years. Very interesting about the “as”. I had not heard that before. THANK YOU!!!!
As With Gladness – The only Christmas song I could find that closely matches.
as
2 /æs/ Show Spelled Pronunciation [as] Show IPA
–noun, plural as⋅ses /ˈæsɪz/ Show Spelled Pronunciation [as-iz] Show IPA .
1. a copper coin and early monetary unit of ancient Rome, originally having a nominal weight of a pound of 12 ounces: discontinued c80 b.c.
2. a unit of weight equal to 12 ounces.
AAYN Episode 34: British Halfpenny Conder Tokens of the 1790s