The five you name are the original. On their 'authorized editions' their pictures appeared with their instruments.
"American Memory" is the online name of the US Government's Smithsonian Museum website which covers history, music, photographs and about anything else you could name- seven million items in their catalogues- and material from other collections as well. Just enter a subject- in this case Ethiopian Serenaders- in 'Search' and you will find the songs I mentioned, plus others: American Memory

(Ignore the first item in the list- there was a later Chautaqua (sp?) circuit group which took that name)

"My Old Aunt Sally," 1847 is the first listed sheet music found with a Search for Ethiopian Serenaders (front cover showing Pell et al.). "Rosa Lee," 1847, is another in their collection, which I forgot to put on my list.

"Hop Lite Loo," which I posted 02 Feb 03 was the 1860s(?) song to which I mistakenly thought you were referring. It is not by them.