Can think of one occasion when "folk" had been imposed on a group of non-folkies in a pub during a festival. It developed into a singaround at one end of the pub with a lot of background talking/shouting. One guy, facing me and away from the bulk of the people in the pub began a well-known song in a very quiet voice, totally drowned out by the background. I joined in with my voice which has been described as "like a mellifluous coalman". The result was that evryone, folkies and non-folkies alike joined in and it finished to the loudest applause of the evening. Did I do right?
Almost as soon as starting, I realised that I should have left the singer to his moment of fame. Everyone needs to start somewhere and the "success" I achieved was unimportant.
I have never done this again.

Eddie