Stories passed own through oral storytelling, and from generation to generation, fall under the broad term traditional literature. Traditional literature gradually altered and matured through various tellings before it was recorded in written form. The Brothers Grimm were the first to systematically collect and record folklore. Within traditional literature there are several categories: fables, folktales, myths, and legends; within the categories are types. Traditional literature is one of the most popular genres in picture books. In the last few decade parodies, or fractured tales, have become very popular.