Thanks, Charlie!

So it's quite possible that the "The Jolly Waggoner" ballad verse quoted was not being used as a shanty. The individual mentioned singing it is earlier noted in the text as being the ship's "comedian" (or something like that) who was always seeing old English songs. Maybe he was just singing it for fun at this point.

I'm noting this because the earlier source we had from this, an Australian maritime website, was quoting it with the indication that it was used to heave anchor.