English Jon, you are being awfully cerebral about this. Input from others is good, but you are neglecting your most important source of information: yourself. Ask yourself, "When I am in the audience, what do I want to see and hear?" Then just do it. Also, your questions seem to be about good marketing. But if marketing and "success" are issues why bother with "folk" music. Finally, GO FOR IT. If you don't do it now, you never will.