C-G Anglo concertina seems to be quite far from C-G diatonic accordion. Tunes which are easy on one can be much more tricky on the other and vice versa. For instance, zelda seems to be not a tune for concertina beginner but it is for diatonic accordion players. I think this tune has been composed by Philippe Plard not on the "paper" but directly on the diatonic accordion. The notes are "under" the fingers and the tune zelda is often used in diatonic accordion workshop.
About strong/weak or first/second beat, I don't understand how does it really work... At the start I thougt it was an error of composition (my apologize to Philippe!...). So I know when I start the tune but I don't understand what it happens after... But in any case, dancers don't care about it!.. We can see it on the flashmob video in Paris..
Here is my C-G diatonic accordion attempt. It was a good opportunity to take it out of its case...... Even If it has 18 keys at the left, I just use the 8 basics keys you have on each two rows and eight bass accordion.
And I agree; it's surprising how many tunes that are relatively easy on Anglo concertina are difficult on diatonic accordion, with the reverse also being true. I like the way it sounds on both instruments despite the fact that they impart very different textures to the tune.
I just tried Zelda on my G/C 2 row melodeon - and yes, it's a lot easier and more natural.
Edited by Jim Besser, 21 April 2014 - 04:33 PM.