Nice to see the link to some of the versions of Summertime.
It also plays nicely on an Em/Am harmonica (no bends)
Surprisingly Summertime was a big time controversial song back then, right when performers were getting away from playing "blackface".
I think it was europe that kept the song popular and over the years it again became popular here in the states, just with out the stereotypical blackface.
At least that's our understanding of it's history.
We love the song. We do it a bit differently but some folks skip the lyrics all together