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
You fit my h[C]ead like a gl[D]ove
You fill my wh[C]ole world with l[D]ove
The kind you ne[C]ver find
You open [Bm]up my mind
[A] [A] [A] [A] [G] [A] [A] [A] [A]
[A]There's a t[G]ree sitting [Bm]in the sh[A]ade
That wa[G]its until the e[Bm]nd of the d[A]ay
And t[G]hen until the m[Bm]oonlight fa[A]des
Cause it kn[D]ows it needs sun[A]light to g[G]row
Like ev[F#m]eryone
[D]Sun halo, hello
I've missed you de[C]arly, you know
It's been a[D]ges since you could come back h[C]ome
My little
[D]Sun halo, hello
You fit my h[C]ead like a glove
You fill my wh[D]ole world with love
The kind you ne[C]ver find
You open [Bm]up my mind
[A] [A] [A] [A] [G] [A] [A] [A] [A]
[A]There's that t[G]ree sitting [Bm]in the sh[A]ade
That gl[G]ows when the [Bm]sky is g[A]rey
Holding two b[G]aby birds a[Bm]bout to ha[A]tch
Mother na[G]ture li[Bm]fted the la[A]tch
Cause she kn[D]ows that the wo[A]rld needs the s[G]un
But two li[D]ttle birds who have n[A]ot lived l[G]ong
Live in ha[F#m]rmony[E]
[A]Sun halo, hello
I've missed you de[G]arly, you know
It's been a[A]ges since you could come back h[G]ome
My little
[A]Sun halo, hello
You fit my h[G]ead like a glove
You fill my wh[A]ole world with love
The kind you ne[G]ver find
[A]Ooh oohooh oohooh oohoohooh \
G > x5
Ooh ooh ooh ooh... /
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
You fit my h[C]ead like a gl[D]ove
You fill my wh[C]ole world with l[D]ove
The kind you ne[C]ver find
You open [Bm]up my mind
[A] [A] [A] [A] [G] [A] [A] [A] [A]
[A]There's a t[G]ree sitting [Bm]in the sh[A]ade
That wa[G]its until the e[Bm]nd of the d[A]ay
And t[G]hen until the m[Bm]oonlight fa[A]des
Cause it kn[D]ows it needs sun[A]light to g[G]row
Like ev[F#m]eryone
[D]Sun halo, hello
I've missed you de[C]arly, you know
It's been a[D]ges since you could come back h[C]ome
My little
[D]Sun halo, hello
You fit my h[C]ead like a glove
You fill my wh[D]ole world with love
The kind you ne[C]ver find
You open [Bm]up my mind
[A] [A] [A] [A] [G] [A] [A] [A] [A]
[A]There's that t[G]ree sitting [Bm]in the sh[A]ade
That gl[G]ows when the [Bm]sky is g[A]rey
Holding two b[G]aby birds a[Bm]bout to ha[A]tch
Mother na[G]ture li[Bm]fted the la[A]tch
Cause she kn[D]ows that the wo[A]rld needs the s[G]un
But two li[D]ttle birds who have n[A]ot lived l[G]ong
Live in ha[F#m]rmony[E]
[A]Sun halo, hello
I've missed you de[G]arly, you know
It's been a[A]ges since you could come back h[G]ome
My little
[A]Sun halo, hello
You fit my h[G]ead like a glove
You fill my wh[A]ole world with love
The kind you ne[G]ver find
[A]Ooh oohooh oohooh oohoohooh \
G > x5
Ooh ooh ooh ooh... /