Misc Christmas - Jolly Old Saint Nicholas chords

The other chord progressions were off so i did this by ear.
[ Tab from: http://www.guitaretab.com/m/misc-christmas/256662.html ]
 G            D         Em                 B
Jolly old St. Nicholas, Lean your ear this way!
 Em              G            A7                D
Don’t you tell a single soul, What I’m going to say;
 G               D            Em                B
Christmas Eve is coming soon; Now, you dear old man,
 Em                 G            D              G
Whisper what you’ll bring to me: Tell me if you can.

When the clock is striking twelve, When I'm fast asleep,
Down the chimney broad and black, With your pack you'll creep;
All the stockings you will find Hanging in a row;
Mine will be the shortest one, You'll be sure to know.

Johnny wants a pair of skates, Susy wants a dolly;
Nellie wants a story book; She thinks dolls are folly;
As for me, my little brain isn’t very bright;
Choose for me, old Santa Claus. What you think is right.