This is jumping the gun -- and maybe destroys John's careful methodology -- but in this exercise of "historical imagination," I'd like to eventually add other possible chanties that are very similar to the ones determined. My rationale would be that, as per my notion of a "chanty" as a "framework" rather than a "piece," other chanties of very similar framework (and within historical reason, textually) could be re-considered. An example would be "Grog Time of Day" suggesting that "Do(odle) Let Me Go" may have also existed. They have the exact same form, I think, and if the language of the latter does not bar it from the time period, then OK. There will be no proof that "Do Let Me Go" was existing, however, for imagination's sake, one might include it.

Gibb