What book is that Mike - I wonder if it was really a concertina? People are often unsure what a concertina is and use it as a generic term for any squeezy free-reed instrument. I have never come across mention of a concertina in memoires of the SCW although I have seen pictures of Brigaders with accordians and possibly a melodeon in one photo of the Abraham Lincoln Battalion. The Bandoneon is a more likely possibilty if it were a Spaniard or South American playing it. But if it was a concertina that would be very interesting.