Fill my life with a song a happy happy song And let the whole world sing it with me As long as you're mine there's happiness in every line And that's the way that our love will always be When you smile you turn all the rain a sunshine When you laugh it's like a pretty melody So fill my life with a song a happy happy song And let the whole world sing it with me [ guitar - steel ] Fill my life with a song a happy happy song... Just let the whole world sing it with me