And what about 'dual' concertinas? Where do they fit in? Are they Anglo or English?
DUET, dear, DUET...but I know nothing hardly about concertinas...they do here though
www.concertina.netThere would be more than a brace of melodeons if I had my way/was astonishingly rich

JK plays a British Chromatic Button Accordion (which looks like a cross between a P**** A******** and a Melodeon) and also a one row four stop hohner pokerwork (Am hugely excited to be having him teach me next weekend).
The Irish call a melodeon an accordion (and so do the Italians and Americans I think)
if someone with negligible musical talents was looking at starting to play a squeezy thing, waht would you suggest?
I never miss a chance to evangelise!!

: Get a D/G melodeon (Hohner Pokerwork is what most start on, mainly due to cost) and just get going! I found it really easy to pick up. I think having very little experience of chromatic instruments is possibly a help since the diatonic - push/pull - nature of the melodeon has messed with the head of my piano playing/flautist friend. She's a piano teacher and pronounced it 'impossible to play'.
Once you can play 'Three Blind Mice' and 'Bobby Shaftoe' go to your local morris side and they will more than likely let you join in and you will learn tunes faster than you thought possible. Eventually you will be spending every 2nd weekend in Nov in Witney, one night a week all summer outside some boozer or other and June, July and Aug at festivals. Extreme cases are diagnosed with 'Melodeon Aquisition Disorder'
All things squeezy (and Squeezy himself sometimes) can be found here:
www.melodeon.net along with any number of melodeon obsessives...me included

Cheers
Fi (where's me bellows....)