I hope you enjoy this and find it useful. I don't understand which is better, so please 
look at the first tab and the second tab (The second tab is at the bottom). Tabbed by: Mea988


(Intro)
|------------------------------------------------------------------|
|------------------------------------------------------------------|
|------------------------------------------------------------------| x2
|------------------------------------------------------------------|
|---3-0--0--0--3-0-3-0--0--0--3-0-3-0--0--0--3-0-3-0---0-3-0-3/5---|
|----------------------------------------------------3-------------|
p.m.

Merry Christmas...
|----------------------------------------------------------------|
|----------------------------------------------------------------|
|---5-0--0--0--5-0-5-0--0--0--5-0-5-0--0--0--5-0-5-0---0-5-0-5/7-|
|---5-0--0--0--5-0-5-0--0--0--5-0-5-0--0--0--5-0-5-0-5-0-5-0-5/7-|
|---3-0--0--0--3-0-3-0--0--0--3-0-3-0--0--0--3-0-3-0-5-0-3-0-3/5-|
|----------------------------------------------------3-----------|

|---------------------------------------------------|
|---------------------------------------------------|
|---5-0--0--0--5-0-5-0--0--0--5-0-5-5-5-5-----------|
|---5-0--0--0--5-0-5-0--0--0--5-0-5-5-5-5-5-5-5-6---|
|---3-0--0--0--3-0-3-0--0--0--3-0-3-3-3-3-5-5-5-6---|
|-----------------------------------------3-3-3-4---|

In a part of the song the guitar on the background sounds a few notes higher. I think 
you have to lower of 1 string (For example: the 2nd string become the 1st). I tested it 
and looks good.

AND THE OTHER TAB:

(Intro)
|------------------------------------------------------------------|
|------------------------------------------------------------------|
|------------------------------------------------------------------| x2
|------------------------------------------------------------------|
|---3-0--0--0--3-0-3-0--0--0--3-0-3-0--0--0--3-0-3-0---0-3-0-3/5---|
|----------------------------------------------------3-------------|
p.m.

Merry Christmas...
|----------------------------------------------------------------|
|----------------------------------------------------------------|
|----------------------------------------------------------------|
|---5-0--0--0--5-0-5-0--0--0--5-0-5-0--0--0--5-0-5-0---0-5-0-5/7-|
|---3-0--0--0--3-0-3-0--0--0--3-0-3-0--0--0--3-0-3-0-5-0-3-0-3/5-|
|----------------------------------------------------3-----------|

|---------------------------------------------------|
|---------------------------------------------------|
|---------------------------------------------------|
|---5-0--0--0--5-0-5-0--0--0--5-0-5-5-5-5-----------|
|---3-0--0--0--3-0-3-0--0--0--3-0-3-3-3-3-5-5-5-6---|
|-----------------------------------------3-3-3-4---|

In a part of the song the guitar on the background sounds a few notes higher (like I 
said before). I think you have to lower of 1 string (For example: the 2nd string become the 
1st). I tested it and looks good.