I'm pleased to say that Masato is at least partly wrong here. (I'm only pleased because it's novel - I've not seen it happen before.)

The Plantation Galop (Billy Paterson; Peter Gray) is a galop - a dance - not a song. The two names are hand written at the bottom of the cover page, apparently the performers. That also exempts the earlier date & leaves "The Music of Morris Brothers," etc as earliest so far - one year earlier than Beadle. The texts seem (quickly) to be the same for all the Am Memory & Levy items.

Note:
    The first two letters of her name,
    Was Loo-egge-ianna Quirl.

And a nother oddity--

    But he went traveling to the west
            For furs and other skins;
    And there was caught and killed and drest
            All by the In-gi-ins.

I know of 'dressed' used to mean 'Put clothing on' or 'Prepared to be cooked (and eaten)' or a few other less likely things. I guess the suggestion is the Indians were cannibals. Perhaps in later years this was changed to a more PC version that they were just Bloody, not actually cannibals.   ??