"according to a couple of sites I looked at" - yeah right.

The Ring-a-Rosy yarn is total bollocks. Doesn't fit the medical and historical facts, zero evidence, and a solid history for the rhyme in variant forms that are completely inconsistent with the legend.

The earlier stages of the AIDS epidemic produced a number of public-health-info pop songs in sub-Saharan Africa. Some were well done and catchy, dunno if they are much remembered now.