Is Nursery Rhime "Ring-a-Round-The-Rosies" is appropriate as this actually refers to the Black Death ?

as well as the responses below, keep in mind that many nursery rhymes aren't as innocent as you would expect a children's song to be. Examples, humpty dumpty fell off a wall and broke, jack got a concussion, a baby fell out of a tree (although my children know the rest of that nursery rhyme as "the baby won't fall, as mummy will catch him/her for she is so tall" lol), 5 ducks ran away from their mum, etc etc