Have only just re-visited this thread and looking for the point I would like to make is a bit like climbing Everest, so I'll assume it hasn't been covered.
We have several singing week-ends and festivals here in the West of Ireland and over the last few years a number of UK visitors have taken to singing along with the solo singer (not just choruses, but the verses). I noticed it beginning to happen when we lived in England, but I hoped it was a passing fad.
When he was performing round the English clubs Walter Pardon was forced to abandon at least two of his songs because this thoughtlessness always put him off.
Is this common in the UK and do you just ship the few who persist in this arrogant display of bad manners over here to get them out of the way?
Jim Carroll