Simple Bm, D, G progression through the entire song. Just follow the chord changes.

I believe in gravity
I can feel it pulling me
Even though I've never seen
I still believe

I have never seen the breeze
But I have seen the trembling trees
And I have never seen the time
But that doesn't mean it doesn't fly by

I believe in gravity
I can feel it pulling me
Even though I've never seen
I still believe

I have never seen You
Except in the sky, the stars, and the moon
And I have never heard You speak
Except in the rain, the wind and the sea

I believe in gravity
I can feel it pulling me
Even though I've never seen 
I still believe

I believe in You
I believe in You

I have never seen Your face
But I believe You're always in the breeze

http://www.theineloquent.com/