Great, but not always appropriate song to the rhythm of the original rhyme

Like all books in this series, this book is really nice and highly appealing to children. However I was a little disappointed by this book as other of the collection, because the song is moving away more than the original. Thus, the refrain "ah ... etc crocrocro" intervenes only beginning and end of the book. Sometimes the verses do not fit exactly with the rhythm of the original rhyme. As I selected this collection mainly for fun approach and illustrated nursery rhymes, I regret these two negative points. After that, it's still a funny story and well illustrated!