By: Matthew Cho.
Listening to music is one of the few experiences shared by nearly every human being. From the bone flutes played by prehistoric humans over 60,000 years ago to the sophisticated digital audio workstations used by musicians today, people have always found new ways to create and enjoy music. This remarkable history reveals a universal truth: music is a prevalent and fundamental part of the human experience. But why do we love music and what exactly is the magic behind music?
To first understand why, we must investigate the physics behind music. Simply put, music is controlled air pressure that gets transformed into electric signals, which then interact with our neural circuits that evolved to detect patterns, speech and emotion.
A sound wave is a ripple of energy that travels through any medium (air, water, etc). A pure sound wave is known by the mathematical function called a sine wave. On its own, the sine wave carries no emotional effect, however combining it with many sine waves that all vibrate in different frequencies results in the richness of music that we recognize and love. Lower frequencies determine the note’s pitch while higher frequencies dictate the instrument’s unique sound. Every instrument has different harmonic patterns which is why we are able to discern the sound of a piano and a guitar, even when they play the same note (Svantek Academy, 2025).
When sound waves reach our ear, they travel into the cochlea where tiny sensory hairs detect the air vibrations and turn them into electrical impulses that the brain can interpret. When processing these electrical signals, the brain does more than simply hear sound. Every major network within the brain works together to identify the rhythm, harmony, loudness, and pitch of the sound. Most importantly, the brain constantly tries to predict what will happen next in the music (Eck, 2024). As you listen to a song, your brain subconsciously forms expectations about the next note or melody. When the music follows these expectations, it releases a surge of dopamine that floods you with satisfaction and pleasure. Conversely, when the music doesn’t follow the expectations but presents an unexpected chord change or beat drop, the brain responds with excitement that also results in the release of dopamine (Jarett Casale & Najib Murr, 2018).
This process of prediction and reward is the fundamental reason behind why you can get “sick” of a song. Repeating a song over and over again prompts the brain to correctly anticipate every note which leads to a lack of dopamine. Eventually, repeated exposure makes every note and beat predictable, reducing the dopamine response and making the song feel less rewarding (Gander, 2017).
Music’s ability to influence our emotions is not the result of a single element but rather a butterfly effect that involves physics, biology, and psychology. A simple vibration moving through the air becomes a complex process where the ear converts sound into electrical signals, which the brain transforms into meaning. Through six million years of evolution, we have gained the ability to recognize patterns, predict what comes next, and correlate sounds with memories. The human brain is what allows the humble sine wave to be more than just the purest form of a wave, and instead a medium that allows complex emotional responses to take place.
References
Eck, A. (2024). How music resonates in the brain. In magazine.hms.harvard.edu. Harvard Medicine. https://magazine.hms.harvard.edu/articles/how-music-resonates-brain
Gander, K. (2017). The science behind “killing” a song when you listen to it too much | the independent. In The Independent. https://www.the-independent.com/life-style/killing-song-science-magic-lost-listen-too-much-sound-good-michael-bonshor-a7728156.html
Jarett Casale, & Najib Murr. (2018). Physiology, cochlear function. In Nih.gov. StatPearls Publishing. https://www.ncbi.nlm.nih.gov/books/NBK531483/
Svantek Academy. (2025). Sound wave. In SVANTEK – Sound and Vibration. https://svantek.com/academy/sound-wave/
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