Why we really really really like repetition in music

In episode #5 of Vox Pop's Earworm, producer Estelle Caswell, comes to appreciate the art of repetition with the help of Colin Morris and Elizabeth Margulis. Colin is a computer scientist who created two really amazing ways to visualize repetition in song lyrics and how they've increased over the last 50 or so years. Elizabeth Margulis has dedicated her career to music research and runs the music cognition lab at the University of Arkansas. Her book "On Repeat: How music plays the mind" delves deep into the science behind musical repetition and explores the many ways our brains react to it.