It's actualy written by JS Bach and is a common Christmas song. "Everyone
rejoice, with heart and song and voice, sing a song of blah blah..."..

CC Piano Chord 
  /  CC Piano Chord 
  / CC Piano Chord 
  FF Piano Chord 
  CC Piano Chord 

CC Piano Chord 
  /  CC Piano Chord 
  / CC Piano Chord 
  FF Piano Chord 
  CC Piano Chord 

CC Piano Chord 
  EE Piano Chord 
  AmAm Piano Chord 
 / DmDm Piano Chord 
 GmGm Piano Chord 
 CC Piano Chord 

FF Piano Chord 
  GmGm Piano Chord 
 CC Piano Chord 
 AmAm Piano Chord 
 DmDm Piano Chord 
 GmGm Piano Chord 
 CC Piano Chord 

FF Piano Chord 
  GmGm Piano Chord 
 CC Piano Chord 
 AmAm Piano Chord 
 DmDm Piano Chord 
 GmGm Piano Chord 
 CC Piano Chord 


or similar. (sounds right).. If you can, thumb the bass note of each chord
and then strike the other notes to get a dum-dy-dum-dy feel.

The lead is a C major scale around the 12 position, starting note is G.
I won't tab it all, but it starts like:

--15---15---13-12--------15-13-12-13-15-------
------------------13---------------------13---
---------------------12---------------------12
----------------------------------------------
----------------------------------------------
----------------------------------------------

If you can't work it out, mail me and I'll do the lot..

Good luck,

Gerrard.