Do you ever get something that just sticks in your head forever, without any understanding why it lives in your memory? You probably have some jingle for a cereal or line from a movie you have’t seen in decades that randomly pops in your head. For me, it’s one of the first songs we learned in elementary school music, The Grand Old Duke of York:
Oh, the grand old Duke of York, he had ten thousand men;
He marched them up to the top of the hill, And he marched them down again.