Re: "Maid going to Comber" etc. I suspect both "Carman's Whistle" and "Watkin's Ale" were inspired by "Malkin was a country Maid" which was earlier. All that survives is on my website, with what I think is a later reworking, "Down in the North Country", in turn condensed to "The Farmer's Daughter of Merry Wakefield". There's a cruder 17th century drollery song that's similar, and survives as a traditional song sometimes called "All Fours".