The song is most the oooo part so give 'er. The chords are those three the whole 
way through, the F and Am are held for 2 beats each and the Bb is for 4. 



F     Am   Bb     
ghost of a boy
hard to catch like light
ill hide you in my body
ill keep you alive

ghost of a boy
hard to catch like light
ill hide you in my body
ill keep you alive


OOooo..