Try this:

C                                    G                     C
Come, they told me, pa-rum-pum-pum-pum
                                             G                     C
A new-born king to see, pa-rum-pum-pum-pum
G                                           C                     G
Our finest gifts we bring, pa-rum-pum-pum-pum
                                           C                     F
To lay before the king, pa-rum-pum-pum-pum
                         C                              G
Rum-pum-pum-pum, rum-pum-pum-pum
C                                 G                   C
So to honour him, pa-rum-pum-pum-pum
G             C
When we come.


(C)                     G                     C
Baby Jesus, pa-rum-pum-pum-pum
                                       G                   C
I am a poor boy too, pa-rum-pum-pum-pum
G                                     C                     G
I have no gift to bring, pa-rum-pum-pum-pum
                                           C                     F
That's fit to give a king, pa-rum-pum-pum-pum
                         C                               G
Rum-pum-pum-pum, rum-pum-pum-pum
C                                  G                   C
Shall I play for you, pa-rum-pum-pum-pum
G         C
On my drum?


(C)                        G                     C
Mary nodded, pa-rum-pum-pum-pum
                                                 G                     C
The ox and lamb kept time, pa-rum-pum-pum-pum
G                                             C                     G
I played my drum for him, pa-rum-pum-pum-pum
                                              C                   F
I played my best for him, pa-rum-pum-pum-pum
                         C                              G
Rum-pum-pum-pum, rum-pum-pum-pum
C                                          G                   C
Then, he smiled at me, pa-rum-pum-pum-pum
G                C
Me and my drum. (Repeat to fade)