Modern examples of evolution, folk process, etc

1) John Tams' "(When we go) Rolling Home" these lines exist in the wild:

The rich man in his finery
the rich man in his fine array
The gentry in their fine array etc etc

2) Mondegreens.

And is there not a case for many songs to be preserved as lyrics? Handed on orally or on paper, taught as poems, which musicians then recognise there is a meter and attach to a new tune? Hard to prove but good fodder for speculation.

And half remembered lyrics often get morphed by the singer to suit their diction.