It's a little embarrassing that this will be the first time I've tagged a post here with John Cale's name. The Velvets are my favorite band of all time, and Cale has certainly had the most diverse solo career.
Here's a song that takes its name from a prose poem by Cale's fellow Welshman Dylan Thomas, but not much else. It has the word "Christmas" in the title, and mentions mistletoe in the first line. Other than that, you're on your own.
I've given you the alternate version, as a taste of the lovely deluxe rerelease of Paris 1919, my favorite Cale solo album. The original album had nine tracks; the new edition has 21, with alternate takes, different mixes, and even a previously unknown song. The buy link goes there, of course.