Judy, way back in this thread, recommended grade-school songbooks as a source for folksongs.

As to tunes, MAYBE so. But as to the words, au contraire!

Those grade-school songbooks are full of watered-down, cleaned-up, bowdlerized, shortened, PC-ified, and often (especially when "translated" from foreign-language songs) completely rewritten crap.

Dave Oesterreich