Which reason explains why many oral stories were rhythmic or sing-songy?

One reason why many oral stories were rhythmic or sing-songy is that it made them easier to remember and pass down from one generation to another. The rhythmic or sing-song nature of oral stories helped in the retention of the story's structure, characters, and events, as it provided a memorable pattern or melody that could be easily repeated and learned by oral storytellers. Additionally, the repetitive and catchy nature of the stories would engage the listeners' attention and make the narratives more enjoyable and entertaining.