Suggest that your publisher contact the folks who own the copyright and ask permission to use it--they grant it regularly, because I have a stack of books, including works about theatre, film, songwriting and of course, books about the Wizard of Oz, each of which contains all or some of the words--one book even has additional verses that were not included in the film--there is no reason that I can think of for you to make your text less interesting because your publisher is lazy--