stormy Oliver

Here's another song comparison:

1) 1928's "West End Blues," written by King Oliver, here in its most famous Armstrong recording; after the fanfare, listen to the first half of the principal phrase.
2) 1933's "Stormy Weather," music by Harold Arlen, here sung by Ethel Waters; listen to the "Don't know why..."

Only half related, but look at Fats Waller's facial expressions here.