I do agree that it’s discourteous to leave as soon as you’ve done your song, but I confess I sometimes have had to do that myself, but normally because I do genuinely need to be somewhere else, rather than rushing off to gatecrash another venue to bore another audience with the same song (which I’m sure some festival punters do).

However, to be fair I’ve also sat for over two hours in a singaround waiting to be asked, and then had to leave before getting a chance because my parking ticket was about to expire. In tune sessions though, that is less of a problem because most of the performances are open to everyone to play along with, usually without fear of ruining someone’s carefully arranged personal interpretation. However, I can think of a few rules of conduct for tune sessions too.....