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... /
Source: http://www.azchords.com/o/oberhofer-tabs-55649/sunhalo1-tabs-866528.html