I thought I'd throw in a name not widely enough known. If you really want to know what can be done with a 2-row G D then may I point you to a CD by a friend called Ben Averis, called "Self contained". Ben has one of the the most musical minds we are likely to hear in a folk club, and therein lies his problem. As a botanist in Scotland he has not pushed himself forward, and probably cares not a fig for what reknown should come to him . I know he has corresponded with Tony Hall, and J.K. and they know of him. If you can imagine a Reginald Dixon (theatre organ) concerning himself with composition, analysis, and variations upon almost any tune you could imagine, then you have an idea how Ben plays. I admit that I personally find his style too taxing mentally, and find myself asking WHY DOES HE WANT TO PLAY THIS ON A MELODEON? Why not make life easy and play it on keyboards, and is this what I would want to attempt myself? more technical than simple and happy- but that's Ben for you. He needs to be considered, even if he makes everyone uncomfortable.