QUOTE(Dave Weinstein @ Feb 19 2004, 06:40 PM)
If you are concerned with existing learning materials, workshops, lessons, and the like, and what you like is the lower tone of the G/D, you might want to consider a Baritone C/G.
Only problem with that is they are vanishingly rare. Apart from my baritone C/G (made for me by Colin Dipper) I have only ever seen one other. Colin made the tone especially reasonant and rich for me, and I truly believe it to be the finest anglo ever made for song accompaniment.
The good news is that Rich Morse has said that the Button Box are developing a baritone version of the Ceili anglo (I am genuinely excited by this, BTW. If the baritone anglo works out as well as the baritone English Rich will deservedly have a real winner on his hands). Rich has a good track record of always delivering on his promises, but they may be some time in coming. So I would not hold up your purchase of your first concertina on the off chance that a Morse baritone will turn up soon.
So that brings us back to your original question: C/G or G/D. For sessions I play the G/D. I love the G/D. I have 4 of them. They make the C/G sound squeeky (no flames please, just my opinion). They fit with the music played in "English" music sessions beautifully. Having said all that I don't think you can draw hard and fast rules like play a C/G for Irish or a G/D for English music. Too much of this is down to personal preference.
In my case I had tried to play a C/G in session, but got nowhere until I got a G/D, when it all started to make sense on a physical level. That is, it felt right. But there are plenty of people playing English music on the C/G (or come to that on English and duet concertinas). And a couple of years back there was a long thread here from people who preferred playing Irish music on the G/D. The only thing I can suggest is try both and find which you prefer. It really is the only way.
Chris