A recent study published in Psychological Science provides evidence that people naturally absorb the underlying rules of music just by listening to it over their lifetime. The findings suggest that both trained musicians and people with no musical background use harmonic context in remarkably similar ways to predict and remember musical patterns.
Scholars have long debated whether formal training is required to understand the deeper harmonic frameworks of music. Music is organized into layers of notes, phrases, and sections, similar to how language is structured into words and sentences. Some experts believe that understanding this organization requires explicit instruction in music theory. Others argue that passive exposure to music allows the brain to learn these rules implicitly.
"Basically everyone is an 'expert' in narratives (at least in the sense that people use language and stories to communicate in everyday life), but not everyone is an expert in music," said corresponding author Riesa Y. Cassano-Coleman, a PhD candidate at the University of Rochester. "So music provides an interesting test case: do we need formal training in music to understand musical structure?"
To test this question, the researchers conducted four separate experiments using piano pieces from Pyotr Ilyich Tchaikovsky's Album for the Young. By scrambling the pieces at various timescales, they manipulated the amount of musical context available to the listener. The conditions included one-bar scrambles, two-bar scrambles, eight-bar scrambles, and completely intact music.
A musical bar, or measure, is a small segment of time containing a specific number of beats. By keeping features like volume, instrument type, and speed constant, the scientists ensured that participants were reacting only to changes in the harmonic structure.
In the first experiment, the researchers tested musical memory. They recruited 108 adults between the ages of 19 and 41, splitting them evenly into musicians with at least five years of training and nonmusicians with no training. Participants listened to a sixteen-second prompt and then identified which of two short musical clips had appeared in it. The results showed that memory improved for both groups as the music became less scrambled.
Musicians performed better overall on the memory task, but both groups benefited from longer stretches of intact music at a similar rate. Even within the musician group, having more years of practice did not predict better memory performance.
The second experiment tested musical prediction using a distinct sample of 108 adults, again divided evenly between musicians and nonmusicians. Participants listened to fourteen-second prompts and then chose which of two short clips best completed the musical sequence. Prediction accuracy increased as the amount of intact musical context increased.
In this prediction task, musicians did not perform better than nonmusicians. Both groups used the available harmonic information equally well to guess what came next. This suggests that people unconsciously apply the rules of music to anticipate upcoming notes, regardless of their formal education.
In the third experiment, the scientists explored event segmentation, which is how people mentally divide continuous sounds into meaningful chunks. A sample of 95 adults listened to one-minute musical pieces and pressed the spacebar whenever they heard a meaningful change in the music.
As the music became more heavily scrambled, all participants pressed the button more frequently. When the music was left intact, both groups successfully identified standard eight-bar phrases as meaningful events. A difference emerged with longer structures: musicians tended to align their button presses with sixteen-bar hyperphrases, which are larger musical sections made up of multiple smaller phrases, while nonmusicians tended to stick to the shorter eight-bar phrases.
The fourth experiment tested explicit awareness of the structural disruptions. Participants had to choose whether the music was scrambled every bar, every two bars, every eight bars, or left intact. Musicians performed better on this categorization task than nonmusicians. This suggests that explicit theory training helps people consciously reason about musical structure.
"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 summarized. "The biggest thing that surprised us was just how similarly musicians and nonmusicians perform in these tasks; musicians did seem to have an advantage in explicit labeling, but otherwise both groups performed better (at similar rates) with more intact context."