I had to Google the first one because the only thing I could think of was "The Shrink Flat" and I'm pretty sure that's not a Christmas song (or a thing).
I never would have figured it out in a million years...
Spoiler!
The apartment of two psychiatrists = The Nutcracker Suite
Hard to say if that's a Christmas Carol. If that's the answer, it should be The Nutcrackers Suite since there are two of them - does the actual title have an apostrophe?
Hardly. I posted a list of the ones I figured out, missing the three in the spoiler tags, and got #### on for sharing my answers. So yeah, Merry ####ing Christmas.
Spoiler!
1.
2. Little drummer boy
3. Deck the halls
4. Silent night
5. Noel
6. All I want for Christmas is my two front teeth
7. It came upon a midnight clear
8. Joy to the world
9. 12 days of Christmas
10. Do you hear what I hear
11.
12. Away in a manger
13.
14. Angels we have heard on high
15. Let it snow
16. We three kings
17. Oh holy night
18. Jingle bell rock
19. Grandma was runover by a reindeer
20. Silver bells
21. We wish you a Merry Christmas
22. God rest ye merry gentlemen
23. Oh come all ye faithful
24. Frosty the snowman
25. I saw mommy kissing Santa Claus
