This is what I think the intro riff is:
E|--------------------------------------------------------------------------------|
B|--------------------------------------------------------------------------------|
G|--------------------------------------------------------------------------------|
D|-------------------------10-9-7-------------10-9-7------------------------------|
A|-5---7-7---9-9---9-10-12--------9---9-10-12--------9---9-10-12-10-9-7---5-5-7-7-|
E|--------------------------------------------------------------------------------|

  D                        C      D           C     D             C

D
Sun halo, hello
            C            D
You fit my head like a glove
              C               D
You fill my whole world with love
               C
The kind you never find
         Bm
You open up my mind

A   A A A G A   A A A 

A          G           Bm       A
There's a tree sitting in the shade
       G              Bm         A
That waits until the end of the day
     G              Bm         A
And then until the moonlight fades
           D               A         G
Cause it knows it needs sunlight to grow
       F#m
Like everyone

D
Sun halo, hello
                  C
I've missed you dearly, you know
           D                              C
It's been ages since you could come back home

My little
D
Sun halo, hello
            C
You fit my head like a glove
              D
You fill my whole world with love
               C
The kind you never find
         Bm
You open up my mind

A   A A A G A   A A A

A             G           Bm       A             
There's that tree sitting in the shade
       G            Bm      A
That glows when the sky is grey
             G          Bm        A
Holding two baby birds about to hatch
         G      Bm         A
Mother nature lifted the latch
            D              A              G
Cause she knows that the world needs the sun
          D                    A         G
But two little birds who have not lived long
          F#m     E
Live in harmony

A
Sun halo, hello
                  G
I've missed you dearly, you know
           A                              G
It's been ages since you could come back home

My little
A
Sun halo, hello
            G
You fit my head like a glove
              A
You fill my whole world with love
               G
The kind you never find

A              
Ooh oohooh oohooh oohoohooh   \
G                              > x5
Ooh ooh ooh ooh...            /