Help!

I'm writing a book, and need to use a popular AABA song as an example of the AABA structure. I've been using "Somewhere Over the Rainbow", but my publisher says there will be a copywright issue and suggested choosing a folk song or something from the 1890s.

I'm having a heck of a time finding something that everyone is familiar with. Any suggestions? I'd greatly appreciate your help.

Thanks,
Dan