BTW,
The chords posred above, in C, don't seem ideal to me.

Here are the chords I use, in the key of G:

G            G7           C                        G
O holy night, the stars are brightly shining;
D7          G                D                G
It is the night of the dear Savior's birth.
G                   G7         C                   G      G7
Long lay the world in sin and error pining,           
                Bm                 F#m              Bm
Till he appeared and the soul felt its worth.   
      D         D7            G
A thrill of hope, the weary world rejoices,    
       D          D7        G
For yonder breaks a new and glorious morn.

Em              Bm
Fall on your knees,     
         C                   Em
Oh, hear the angel voices!   
    G  D7         G   C
O night    divine,   
      G                D7            G
O night when Christ was born,  
    D    D7       G C     G           D7        G
O night,      O holy   night, O night divine!