The human brain operates as a tireless prediction machine. It watches a dropped glass and anticipates the shatter. It listens to a conversation and guesses the final word of a sentence. And, as it turns out, it listens to a melody and inherently knows exactly what chord should fall next.
If there’s something in the world most people tend to agree is that they love music. But to feel the music, our minds must decode a hidden framework.
“Music in general, especially when we’re listening attentively, seems to help modulate our emotions,” said Riesa Cassano-Coleman, a graduate student in Elise Piazza’s lab at the University of Rochester, in an interview with the Observer. “During a film, if you hear scary music, it makes it scary. If you take away the music, you’re like, ‘Oh, that’s not that bad.’”
Do you need formal instruction to understand the deep harmonic architecture of a song? Some experts argued that music theory acts as a necessary key to unlock these patterns. Others suggested our brains pick up the rules organically, much like we learn our native language.
Now, a new study in Psychological Science provides a definitive answer. Researchers discovered that almost everyone naturally absorbs the complex, underlying rules of music simply by living their lives. You do not need to read sheet music. You do not need years of piano lessons. Just by listening, your brain masters the tonal context that gives music its meaning.
Chopping Up Tchaikovsky
To show that a non-musician understands complex harmony, the researchers found a clever solution: they broke the music apart.
The team wanted to see how the amount of coherent musical information alters a person’s ability to process it. “There has been quite a bit of work looking at how listeners build up musical context, but the open question was how much context is actually used,” said corresponding author Riesa Y. Cassano-Coleman, a PhD candidate at the University of Rochester and member of the SoNIC lab, to PsyPost.
“So, music provides an interesting test case: do we need formal training in music to understand musical structure?” Cassano-Coleman added.
To test this, the scientists manipulated the amount of context a listener received. They took piano pieces from Pyotr Ilyich Tchaikovsky’s Album for the Young and scrambled them at different timescales. Some tracks played intact. Others faced disruption every eight bars, every two bars, or even every single bar.
“On the surface, our different musical stimuli sound pretty uniform: same piano timbre, same tempo, no change in dynamics (volume),” Cassano-Coleman explained to PsyPost. “So the only thing that changes across conditions is the underlying structure. What we wanted to test is to what extent listeners used that structure, specifically to remember and predict in the music.”
When you dice up music this way, it disorients the brain. “It kind of sounds weird,” said Cassano-Coleman to the Observer. “Acoustically, it sounds smooth, it sounds fine, but it just sounds like it doesn’t make sense.”
“Tonal context is just kind of how the music makes sense,” Cassano-Coleman added. “If you’re in the key of C, then the home note C is the one that makes the most sense within the environment. The different patterns of the different notes and the different rhythms all kind of fit in that environment.”
The Universal Ear
The researchers subjected both trained musicians and non-musicians to a battery of tests. In the first experiment, 108 adults between the ages of 19 and 41 listened to a 16-second prompt. They then had a mere one and a half seconds to identify a short musical clip from it.
The results surprised the team. Both groups remembered the music much better when the scientists gave them longer, intact stretches. They discovered that listeners use the entire 16-second segment to form a mental sequence.
“They do use that whole segment, the whole 16 seconds,” said Cassano-Coleman. “When we disrupt that, that disrupts the processing.”
A second test asked another 108 participants to listen to a 14-second prompt and predict the next notes in a sequence. Here, the non-musicians matched the musicians perfectly. Both groups utilized the available harmonic information equally well to guess the upcoming notes.
“We were thinking that formal training would give musicians an advantage, but really it seems like our everyday walking around, just listening and being exposed to music, is enough for our brains to learn,” said Cassano-Coleman to the Observer. “In the case of memory, you have that context, that kind of structure that you can go back and say, ‘Oh, I heard this little snippet in there somewhere.’ Or with prediction, it gives you enough context to then predict what’s coming next.”
This natural prediction allows us to prime our emotions. It explains why major chords feel brighter and minor chords feel darker, or why fast music builds anxiety while slow music calms us. Our brains rely on these built-in expectations.
The Edge of Expertise
But if everyone holds this natural ability, do musicians possess any special advantage? The scientists addressed this in their final two experiments.
They asked 95 adults to listen to one-minute pieces of music and press the spacebar whenever they heard a meaningful change. This process, called event segmentation, requires the brain to mentally divide continuous sounds into chunks. Both groups successfully identified standard eight-bar phrases. But musicians took it a step further, recognizing larger, 16-bar hyperphrases.
“The event segmentation task requires context integration in real time: in order to segment the music into meaningful events, as you’re listening, you have to remember what you just heard, predict what’s coming next, and decide if it’s enough of a meaningful change to mark an event boundary,” Cassano-Coleman told PsyPost.
Furthermore, when asked to explicitly label the level of scrambling, musicians outperformed non-musicians. Their formal training gave them the vocabulary to consciously reason about the structure. Yet, both groups struggled most with identifying the completely intact music and the highly chaotic one-bar scrambles.
“What we found is that listeners do integrate musical context over time, and that you don’t need formal training to make use of it,” Cassano-Coleman concluded to PsyPost. “The biggest thing that surprised us was just how similarly musicians and non-musicians perform in these tasks — musicians did seem to have an advantage in explicit labeling (experiment 4), but otherwise both groups performed better (at similar rates) with more intact context.”
An Innate Skill
This research broadens our understanding of human cognition. It places musical comprehension right alongside our innate grasp of spoken language. Although it’s worth mentioning, the study did rely strictly on Western classical music, leaving exciting questions about how we process diverse global genres.
Future research will put listeners in fMRI scanners to watch the brain in action. “In terms of future directions, we’re interested in what’s happening in the brain as people listen to or as expert pianists play these scrambled stimuli in the fMRI scanner,” Cassano-Coleman said. “Stay tuned for that!”
Until then, we can take comfort in the brilliance of our own minds. “Our brains can use the information in the music that’s in front of us in really cool ways,” Cassano-Coleman continued. “Even when we aren’t specifically trained to play music, we still pick up enough of it just walking around, listening.”
The findings appeared in Psychological Science.