Again Ake. I think, while maybe it could be taught, some things may lie in the range of what we hear? I can for example give some form of "Freight Train" and can for example make Leaving of Liverpool, Hard Times and maybe I've got a lovely bunch of cocounts, I've Got Sixpence, Tenessee Waltz, The Owl and the Pussy Cat, etc, whereby, while not well done, one would hear the tune in some form(s) of melody chord finger way and can (at least if we stay down the bottom), often make other things semi recogisable. You know where the melody is to get the say thumb to oblige is not that difficult.

Having seen a demo on Youtube, Status Quo and the Caroline is not that hard - an aim to play a reel like Trip To Durrow on Guitar melody line would be far harder but some attempts at folk are more natural to me than say rock and so we could go on...