Maybe you’ve been a musician your whole life. Maybe you’re an adult picking up a new instrument. Maybe, like me, you’re a teenager who started early and hopes to continue making music for years to come. Or maybe you don’t play an instrument at all. Either way, have you ever wondered what actually happens inside your brain when you listen to or make music? Does starting young really make a difference? And what changes in the brains of musicians compared to non-musicians?
Before we answer those questions, let’s start with the basics. Musical processing has three main components: melody, harmony, and rhythm. Melody is a pattern of pitched sounds that unfolds over time. Harmony is the combination of multiple pitches played simultaneously to form chords and chord progressions beneath the melody. Rhythm is the structured arrangement of sounds over time, allowing us to recognize patterns and the beat of a piece.
In these two reviews by Miendlarzewska et al. and Vuust et al., researchers introduce a model called Predictive Coding of Music. The core idea is that music perception relies on the brain’s incredible ability to make predictions. While listening to a piece, your brain is constantly trying to anticipate what will happen next.
There are two important mechanisms that work with this predictive model. The first is prediction error, which occurs when your expectations are not met. These prediction errors create impulses for action, encouraging your brain to correct itself. What does this actually look like? Imagine you’re sitting in an orchestra, and suddenly your section begins drifting away from the conductor’s tempo. Almost instinctively, you begin tapping your foot to reinforce the beat and help yourself stay together with the conductor. Your brain is trying to reduce the prediction error by updating its expectations in real time. Perception and action work together to continually refine these predictions, allowing you to stay synchronized with the music.
Now that we understand how prediction works while listening to music, let’s take a closer look at how the brain processes music itself.
Melody is processed through three main components: pitch, pitch chroma, and pitch height. Pitch is your brain’s interpretation of where a note falls within a musical scale. Pitch chroma can be thought of as the “color” or identity of a note. Whether you hear a C4 or a C5, your brain still recognizes both as the note C because they share the same chroma. Finally, pitch height simply refers to how high or low a note sounds. Different brain regions contribute to each of these processes. The planum temporale is involved in processing pitch height, the planum polare helps process pitch chroma, and the ventral auditory stream contributes to recognizing pitch itself.
These are the basic mechanisms that allow anyone—musician or non-musician—to understand melody. However, researchers found that musicians are generally much better at distinguishing between different melodies than non-musicians. Even more fascinating, professional pianists have been shown to display motor-related cortical activity while simply listening to piano music. In other words, they aren’t only hearing the music— they are subconsciously imagining the physical movements required to play it.
Harmony refers to the relationships between different pitches played at the same time. Certain combinations of notes naturally sound smoother than others. Consonant intervals, such as octaves, perfect fifths, and perfect fourths, are generally perceived as pleasant and stable. Dissonant intervals, including seconds and sevenths, often sound more tense or unstable. Interestingly, both musicians and non-musicians tend to have similar emotional responses to harmony. For example, a C major chord is often perceived as happier than a C minor chord, even by people with little formal musical training. Where musicians begin to differ is in their experience. Through years of active music-making, they develop stronger perception-action networks, allowing them to predict harmonic progressions more accurately and engage motor systems while listening. Their brains are constantly anticipating where the harmony will move next.
Rhythm is perhaps the easiest component to recognize because it gives music its sense of movement. There are two fundamental concepts in rhythm: meter and pulse. Meter is the overall framework that organizes recurring patterns of strong and weak beats, while pulse is the steady beat—much like the ticking of a metronome. As you listen to music, your brain immediately begins searching for rhythmic patterns. These patterns create short-term expectations, allowing your brain to predict what should happen next. The first time you hear a piece, prediction errors occur more frequently because your brain doesn’t yet know what to expect. However, after repeated listening, those predictions become increasingly accurate. Even if someone has never studied music, this predictive process still takes place automatically.
So far we’ve explored how music is processed in the brain. But what happens when you actually learn to play an instrument?
Playing music places remarkable demands on the brain. It requires both implicit and explicit learning. Implicit learning is the unconscious acquisition of skills through experience. For example, many people can sing a familiar tune reasonably well without ever taking music lessons because they’ve been surrounded by music throughout their lives. Explicit learning, on the other hand, is intentional. Taking piano lessons, practicing scales, learning to read sheet music, or mastering a new instrument are all examples of explicit learning.
The researchers found several fascinating differences between musicians and non-musicians. Musicians generally demonstrate stronger cognitive abilities due to differences in both brain structure and brain function. Piano training, in particular, has been associated with increased white matter development, meaning the brain strengthens communication between different regions. Musicians also show greater functional connectivity within motor and multisensory areas, while professional musicians demonstrate stronger connections between premotor and prefrontal brain regions. The review also suggests that musical training can begin benefiting the auditory system from around age two onward. Between approximately ages two and seven, the brain appears especially responsive to musical training. However, this certainly doesn’t mean it’s “too late” afterward. The researchers explain that the brain structures that become more plastic during childhood often remain more adaptable well into adulthood. Those who receive musical training during childhood have also been shown to develop stronger language abilities, mathematical skills, attention, memory, and executive function. In fact, one study included in the review found improvements in executive function after just 20 days of musical training. Researchers also observed a positive relationship between childhood music lessons and higher IQ later in life.
Ultimately, these reviews demonstrate just how remarkable music is for the brain. Whether you’re a lifelong musician, someone beginning lessons later in life, or simply someone who enjoys listening to music, your brain is constantly predicting, adapting, learning, and forming new connections. While starting musical training early appears to provide the greatest long-term advantages, research continues to show that it is never too late to engage with music!
