Normally, for xmas songs, I'd start and end with Fairytale of New York as I'm an old cynic.  And that'll be it apart from maybe a bit of Stop the Cavalry.  However, 2020 has been a rather interesting year, and there's actually been some very nice stuff released.
So I thought I'd start with what now appears to be a bit of nostalgia:  People actually smiling, talking and enjoying a pint together.  This a lovely collaboration of Patty Gurdy and Fiddler's Green.
As ever thoughts and contributions welcome.

https://www.youtube.com/watch?v=ZqesZeoiE6I

Well, if you have the X factor, why not exploit it!  No wonder Santa is knackered.

https://www.youtube.com/watch?v=J5-bvK8e0_g

https://m.youtube.com/watch?v=6U2XdkBkTTk

LadBaby got three Xmas Number Ones in a row.  Nice one!

https://www.youtube.com/watch?v=s-shDEK85uA