The point being made was that these musicians did not have or need a huge repertoire, they were performing a function just like I do with my slating....I don't need to practise my craft after seventy years and these old boys knew their limitations just like Jon says, but they made everyone's burden just a little bit lighter by their music making. Their music was not always perfect, but that added to the general enjoyment and hilarity and folks appreciated them, today they would be mocked and insulted.