I just got the ABC for "Badby Trunkles" (didn't know it).

The tonality isn't the main issue. It must be fiendishly difficult to memorize if you didn't learn it while actually playing for dancing - the repeat pattern is like nothing else I've ever seen. Doubtless it makes sense if you're watching a sequence of dance figures, but without that you don't have any musical cue to tell you which melody fragment to play next.