I'll second the advice above about concertina.net given by much wiser and older (in terms of playing years, she says hastily) concertina hands than myself ( a newbie of 10 months' standing) ... there's more information on there than you could shake a stick at (whatever that may mean)... comparisons of systems, instruction manuals etc etc etc. I'd hankered after playing a concertina for years, but had thought on the advice I was given around 1990 that it might be an English.

However, after being unduly swayed by explanations of what a duet was by a certain duet player of long standing (I'd never heard of it as an option before then), and being allowed the chance to try one out ... that's what I now find myself learning to play.... and making up for years of lost time. It's swiftly become an addiction, and I, who always considered myself a singer and "not interested in tunes" am obviously suffering a sea change ... worrying?? Practice here we come again .... I need my fix...