I've heard versions of Barbry Allen to a few different tunes. Tim Jacques posted lyrics here ro a very different Gaelic song that is most often sung to one of the airs most associated with Barbara Allen. But I didn't really think it fits in this discussion, so I've give Teannaibh Dlùth 's Togaibh Fonn its own thread: https://mudcat.org/thread.cfm?threadid=169470