Here's a tune that Louis Armstrong made famous... and then my piano/version. There's one thing I have over Armstong-- I'm playing it on the piano at the same time I'm singing it.
The two unique chord points by composer GEORGE DAVID WEISS involve the bVI... which comes at the point when you sing "I think to myself". The other unique point is "see friends shakin hands"... there's a tension there with vi-V-vi-V-vi-#io-ii-#io-V7. I'll discussion those more in the... discussion. These chord changes are worth noting and can be used in may different songs. The genius of the song isn't so much in Louis Armstrong's delivery, in my view, as in Weiss's composition. I think Armstong overdoes it. DISCUSSION FOR WHAT A WONDERFUL WORLD