The Science of Music: Repetition, Prediction, and Emotion in Unexplainable

Overview

In this episode of Unexplainable, musician Amelia Meath of Sylvan Esso joins scientist Elizabeth Margulis to explore why music feels magical and how the brain makes us move, cry, and feel chills. Through an intimate discussion of Sylvan Esso’s Back Again and other musical ideas, the episode unpacks how rhythm, repetition, and prediction shape perception and emotion.

Key insights

• Repetition can increase enjoyment and the sense that a piece was crafted by a human composer.
• Groove and false downbeats create anticipation that pulls the listener into the music.
• Predictive processing and repeated listening shift neural processing from conscious to automatic systems, freeing attention for richer perception.
• Chills and tears arise from a blend of surprise, repetition, social contagion, and personal memory.

Introduction: Magic meets science

The podcast opens with a familiar scene for Unexplainable listeners: a musician who treats music as a magical experience and a scientist who studies why that magic is real. Amelia Meath, known for Sylvan Esso, shares how she writes music in the air and then collaborates to craft arrangements with Nick Sanborn. Elizabeth Margulis from the Music Cognition Lab at Princeton explains that listening to music engages motor and prediction systems in the brain, and that this engagement helps explain why we feel moved by rhythm and groove.

The conversation uses Sylvan Esso’s new album Ow Infinity, and the track Back Again in particular, as a focal point. The track begins with a repeating synth line and a conventional groove that gradually shifts, creating a visceral moment that listeners report as goosebumps or a physical charge. The two guests explore how emphasis shifts within a beat and how a false downbeat can tilt perception, making the rhythm feel ahead of or behind the expected beat. This discussion sets up the core theme of the episode: music is a dynamic interaction between anticipation, surprise, repetition, and the body’s motor systems.

Rhythm, groove and prediction

Elizabeth explains that the brain predicts what comes next during music listening, and when a musical event deviates slightly from expectation, listeners experience a surge of engagement and emotion. The science of prediction is not just about “surprise” but about how rhythm and meter enable people to anticipate and then be reeled in by the music. Amelia adds that writing music in a way that isn’t merely “beautiful” but also surprising keeps listeners invested. They discuss the idea of music as a language, but also the value of approaching sound from first principles rather than leaning on linguistic models.

Experiments on repetition and human-attribution

The scientist describes a study in which short excerpts by 20th century composers Berio and Carter were edited to add obvious repetition. Subjects who heard the repetitive versions tended to report greater enjoyment and an increased likelihood that the music had been composed by a human rather than generated by a computer. This finding challenges assumptions about repetition being merely a tool for accessibility or simplicity, showing that repetition can paradoxically enhance perceived human creativity in unfamiliar music.

Perception, emotion and physiology

The dialogue connects musical structure to visceral responses. Amelia notes that when she performs repetitive material, she still experiences newness in each performance, a sentiment echoed by Margulis who explains chills, hair-raising sensations, and tears often coincide with moments of larger-than-expected musical gesture or dramatic structure. They emphasize that chills are contagious in audiences and that social resonance amplifies individual emotion.

Neurological pathways and repetition

A central concept is that repetition changes how we listen. Early listening relies more on conscious processing in the frontal cortex, but with repetition, the brain increasingly engages automatic systems in the basal ganglia and related motor circuits. As listeners hear more, overlapping lines and emergent patterns become detectable, and the brain can explore higher-level relationships among parts of the music. This mechanism is illustrated with Steve Reich’s New York Counterpoint, where repetitive lines gradually reveal emergent textures and polyphony as the listener’s brain learns to hear multiple strands at once.

Musical language, magic, and the future

The guests reflect on whether music is a language, or something more primitive and different. They discuss the tendency to model music after language in cognitive science but also the value of developing a first-principles approach to sound. The scientist emphasizes that understanding music should not sap its magic; rather, science can illuminate why music feels magical and how to amplify its impact without reducing its wonder. The episode closes with optimism about the expanding field of music perception and cognition and the exciting research opportunities ahead.

Takeaway

Music moves us through a collaboration of repetition, prediction, and emotional release. The brain’s motor systems, social context, and memory all contribute to the powerful experiences listeners report, from goosebumps to tears to a sense of shared time with others on the dance floor.