When Bible writers adopt stories from other cultures, they would naturally do some modification to avoid being blamed for blind copying, thus they would add things such as "Job's servants were also killed."
Apparently that's how the song of songs got into the Bible. It was added around the time of the Babylonian captivity - it was the Shakespeare of Its day, the greatest piece of literature of the Persians so it was sort of rude not to.
Speaking of rude, the Shulamite maidens "belly button" was one bit that was changed....it was some kind of button and very private, apparently!!!!