Name that Christmas Tune

These are riddles, of a sort. Based on the description given of a song, you must guess its real title.

For the answers, click on "read more" at the bottom of this post.

Can you name these Christmas songs?

1. Oh member of the Round Table with circular missing areas.

2. Boulder of the tinkling metal spheres.

3. Wanted in December: a pair of upper, forward incisors.

4. A psychiatrist's luxury apartment.

5. The lad is a diminutive percussionist.

6. Sir Lancelot afflicted with laryngitis.

7. Decorate the anterooms.

8. Cup-shaped instruments fashioned of a whitish metallic element.

9. Oh small Israeli urban center.

10. Distant in a haybin.

11. We are Kong, Lear, and Nat Cole.

12. Duodecimal enumeration of the passage of diurnal intervals in the Yuletide festival, terminating in Epiphany.

13. Depart and vocally transmit information upon an orographic locale.

14. Our fervent hope is that you thoroughly enjoy the Yuletide season.

15. Listen, the Cherubim and Seraphim are proclaiming tunefully.

16. As the agrarian guardians of the woolly ruminants protected their charges in the nocturnal period.

17. I perceived a triad of buoyant conveyance platforms.

18. Jubilation to the totality of the terrestrial sphere.

19. Do you perceive the longitudinal waves which stimulate my auditory sense organs?

20. A joyful song of reverence relating to hollow metallic vessels which vibrate and produce tintinnabulation when struck or shaken.

21. Parent was observed osculating a hoary, unshaven teamster.

22. May the Deity bestow an absence of fatigue upon cheerful and refined human males.