Justr a thought about "stand around the demi-john"
I remember reading somewhere (sorry, no reference available) that old-time dancers sometimes demonstrated their skill by stepping around - and over - a demi-john (a gallon liquor jar) without touching it (A bit like the bacca-pipes jig or the broom dance.)
Since "Green corn" is clearly a dance tune, this might be how the demi-john got in there.
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sj