Christmas Carol Puzzle

The following are clues to the names of well-known Christmas carols. Can you guess the names of the Christmas songs form the cryptic clues provided below?

1. APPROACH EVERYONE WHO IS STEADFAST.
   
   
2. ECSTASY TOWARD THE ORB.
   
   
3. LISTEN, THE FORETELLING SPIRITS HARMONIZE.
   
   
4. HEY, MINUSCULE URBAN AREA SOUTH OF JERUSALEM.
   
   
5. QUIESCENT NOCTURNAL PERIOD.
   
   
6. THE AUTOCRATIC TROIKA ORIGINATING NEAR THE ASCENT OF APOLLO.
   
   
7. THE PRIMARY CAROL.
   
   
8. EMBELLISH THE CORRIDORS.
   
   
9. I'M FANTASIZING CONCERNING A BLANCHED YULETIDE.
   
   
10. I OBSERVED MY MATERNAL PARENT OSCULATING WITH A CORPULENT UNSHAVEN MALE IN CRIMSON DISGUISE.
    
    
11. DURING THE TIME OVINE CARETAKERS SUPERVISED THEIR CHARGES.
    
    
12. VIRTUOUS ROYAL PHILANTHROPIST.
    
    
13. THE THING MANIFESTED ITSELF AT THE ONSET OF A TRANSPARENT DAY.
    
    
14. WHAT OFFSPRING ABIDES THUS?
    
    
15. REMOVED IN A BOVINE FEEDING TROUGH.
    
    
16. VALENTINO, THE ROSEATE PROBOSCIS WAPITI.
    
    
17. THE SLIGHT PERCUSSIONIST LAD.
    
    
18. FATHER CHRISTMAS APPROACHES THE METROPOLIS.
    
    
19. SERAPHIM WE AURALLY DETECTED IN THE STRATOSPHERE.
    
    
20. THE CREATOR REASSURES YOU, LIVELY FELLOWS.

I posted this over at my blog sometime ago, thought I would post it here for you. Enjoy ~ K.
(PS: Where's the answers? Oh come on you can figure it out.)