Legman was writing ten years or more before the paper I mentioned was published, so can't really be blamed for not knowing about it! The piece in JEFDSS 1958 (vol. VIII pp 152-153) was a set recorded by Peter Kennedy from Harry Cox (Norfolk); Bert Lloyd and Patrick Shuldham-Shaw added comments which both appear to be wrong in the light of later scholarship, though Lloyd was, it seems, the less mistaken of the two; neither was aware of the 17th century broadside.