Which is why they are great for listening practice, especially for intermediate and advanced learners. You see, if you only listen to easy English, your listening won’t improve much. (It’s like lifting very light weights and expecting your muscles to grow big. It won’t work so well.) A more effective way to improve your listening skills is to listen to something difficult, like movies and TV shows. By watching various shows, you’ll encounter both standard and regional accents of the English language. With enough practice, you’ll become more familiar with all the common accents, and you’ll get better at making out what native speakers are saying in real life.