Coincidentally, Alan Day has posted a comment on the Concertina.net forum about the difficulties of playing at a singaround (not a session) with most of the company singing along or humming the tune. I was accompanying Al last night at this particular singaround, and I was aware that Al had been distracted slightly by the joining-in - but not so much as to impair his performance, IMO. In any case, I was there to keep the tune structure intact, and my parts weren't as complex as his.

I have to say that, for such a good crowd to join in singing instantly and spontaneously, almost as soon as the tune had started, was a tremendous compliment, and there was a huge round of applause afterwards. So a success, in my view - but I was playing guitar, not a 38-button Jefferies!