pretty sure its all accurate, lyrics taken from some random site but seem accurate too.
standard tuning
i recommend the following chord positions, they are the easiest/best sounding in my 
opinion. Your results my vary. played with a reggae feel on the off beat, mostly the e,b,g 
strings but i put the full chords if that tickles your fancy.

   G#   A#m   Cm        C#    D#
e  4    6     8         4     6
B  4    6     8         6     8
G  5    6     8         6     8
D  6    8     10        6     8
A  6    8     10        4     6
E  4    6     8         x     x

        G#
'Cos if we lived a long time ago,
                                   A#m
These would be my love letters to you, to you
Cm              A#m
If we lived a long time ago
Cm                     A#m             G#
These would be my love letters to you, to you

             G#
Well these words that I write, they go up in the sky

Sit up in space, come down in your eyes
A#m
It's true, it's true
G#
I don't need no birds that fly, I can send my love through the satellite?
A#m
It's true, it's true


        G#
'Cos if we lived a long time ago,
                                    A#m
These would be my love letters to you, to you
G#
if we lived a long time ago,
                                  A#m
These would be my love letters to you, to you

Cm              A#m
If we lived a long time ago
Cm                     A#m           G#
These would be my love letters to you, to you

Cm              A#m
If we lived a long time ago
Cm                     A#m             G#
These would be my love letters to you, to you

G#
Well I don't need no plane or train or automobile

To send you all my love and ask you, "How do you feel?"

A#m
It's true, it's true

G#
I used to keep your letters underneath my bed

Now at a push of a button, they go straight to my head
A#m
It's true, they go straight to my head

Cm              A#m
If we lived a long time ago
Cm                     A#m             G#
These would be my love letters to you, to you

Cm              A#m
If we lived a long time ago
Cm                     A#m             G#
These would be my love letters to you, to you

C#                                    D#
And if there was a blackout, I would have to let you know
C#                                      D#
I'd light a thousand lanterns in the sky and let them go
C#                                          D#
I'd watch them float away and burn out right next to the stars
C#                                            D#
But at least you'd know that I sent my love and the brightest ones were ours

G#
if we lived a long time ago,
                                   A#m
These would be my love letters to you, to you

Cm              A#m
If we lived a long time ago
Cm                     A#m            G#
These would be my love letters to you, to you

Cm              A#m
If we lived a long time ago
Cm                     A#m             G#
These would be my love letters to you, to you