A little more to go on: the real question is where that American version of "The Nightingale" comes from.

As I was a-walking and a-rambling one day I met a fair couple a-making their way, and one was a cowboy and brave one was he and the other was a lady and a fair one was she, and the other was a lady and a fair one was she.

Listed as "Words traditional, new arrangement by Mary Robbins."

How rearranged is it? The tune sounds at least related to other versions.

~ Bj