I find the following endlessly depressing, when played incessantly from mid-November until December 31:

I'm Dreaming of a White Christmas
Jingle Bells
Little Drummer Boy
Christmas Time in the City
Away in a Manger
Jingle Bell Rock
The First Noel
We Three Kings
Grandma Got Run Over By A Reindeer
It Came Upon a Midnight Clear
Chestnuts Roasting On An Open Fire
Feliz Navidad
Silent Night
and on
and on
and on
and on
and on
and on
and on
And over and over
and over and over
and over and over
et cetera, et cetera, ad nauseam

Subjected to enough of the above, I might just shoot myself!

Bah! Humbug! To quote a great but misunderstood genius of past times.

Dave Oesterreich