The Science of How Music Reduces Stress - Mechanisms of Music Therapy and Everyday Applications
How Music Acts on the Brain
When you listen to music, the brain's reward system (the nucleus accumbens and the ventral tegmental area) is activated and dopamine is released. In a study reported in 2011 by Professor Zatorre and colleagues at McGill University (Montreal Neurological Institute), PET scans directly confirmed that dopamine is released in the striatum at the moment when a favorite piece of music brings on a peak of emotion. This response uses the same reward circuit as eating and sexual activity, which explains why music produces an instinctive sense of pleasure.
Music also suppresses activity in the amygdala, calming fear and anxiety responses. Pieces with a tempo of 60 to 80 BPM synchronize easily with the heart rate, shifting the balance toward the parasympathetic nervous system and guiding the body into a state of relaxation. This phenomenon, known as entrainment, is the physiological mechanism that underpins music therapy.
Cortisol and Music
Secretion of cortisol, the stress hormone, settles down when you listen to music. If you listen to calming music for about 30 minutes after a period of sustained tension, cortisol secretion subsides in step with the loosening of your heartbeat and breathing, and you return to a normal state faster than if you had sat with your feelings in silence.
What is interesting is that the effect differs by type of music. Classical and ambient music are the most effective at lowering cortisol, while heavy metal and techno tend to raise it instead. That said, some research finds a stress-reducing effect regardless of genre as long as the music is what the listener prefers, which makes personal taste an important variable.
Clinical Evidence for Music Therapy
Music therapy is not merely a relaxation technique. It is an established treatment used in medical settings. In a Cochrane review (2017, nine trials with 421 people in total), groups that received music therapy in addition to usual care showed a significant improvement in depressive symptoms, and the effect size was large, at a standardized mean difference of -0.98 by clinician rating. However, the certainty of the evidence was rated as moderate, and the long-term effects are still not well understood.
Music is also effective at reducing preoperative anxiety. According to a 2013 Cochrane review that pooled 26 trials (2,051 people in total), patients who listened to music before surgery showed a reduction in anxiety scores that was 5.72 points greater than that of patients who did not. The same review concluded that music can serve as an alternative to sedatives and anti-anxiety medication. In neonatal intensive care units (NICUs), music therapy with live performance has also been reported to promote heart-rate stability and weight gain in premature infants. Music therapy is a means of improving the quality of care as a complement to drug treatment.
How Tempo and Tonality Affect Emotion
The building blocks of music each trigger different emotional responses. Fast pieces (above 120 BPM) raise arousal and evoke energy and excitement. Slow pieces (60 to 80 BPM), on the other hand, have a calming effect, lowering heart rate and respiratory rate.
Tonality matters too. Major keys are linked to happiness and brightness, while minor keys are associated with sadness and introspection. Listening to sad music is not necessarily negative, however. Hypotheses have been proposed that involve hormones such as prolactin to explain how sad music works as consolation, but the physiological backing is still in the process of being verified. Even so, the experience of feeling settled after listening to a sad song when you want to cry is widely shared, and one likely reason is that the music gives an outline to the emotion you are carrying.
Using Music for Everyday Stress Management
To put music to work in stress management, the key is choosing pieces to match the situation. On the morning commute, bright pieces at 100 to 120 BPM lift your mood, while for concentration at work, ambient music without lyrics or classical music is a better fit.
For relaxation before bed, listening to calming music at a tempo of around 60 BPM for 30 to 45 minutes is recommended. In a randomized controlled trial conducted in Taiwan in 2005, 60 people aged 60 to 83 who struggled with sleep listened to 45 minutes of calm music before bed for three weeks; how quickly they fell asleep, how long they slept, and how little they woke during the night all improved significantly, and the effect accumulated week by week. Combined with breathing techniques, the relaxing effect of music becomes even stronger. Matching a rhythm of four seconds in and six seconds out to the tempo of the music promotes activation of the parasympathetic nervous system.
The Effects of Active Music Making
Beyond listening, active musical activity such as playing an instrument or singing yourself brings even greater mental health benefits. People who take part in choral singing have been reported to show increased secretion of oxytocin (the bonding hormone) and reduced feelings of loneliness.
Playing an instrument activates the prefrontal cortex, the motor cortex, and the auditory cortex at the same time, enhancing the brain's plasticity. Even as a beginner, as you keep up practice once or twice a week, you develop the capacity to sit with the stretches of time when the sound will not come out as you intend, along with a sense of forgiving yourself for not getting it right. There is no need to play perfectly; the act of making sound itself gives the brain good stimulation. The habit of expressing emotions through music contributes to emotional stability.
Combining Music and Mindfulness
Rather than having music on in the background, "music mindfulness" means consciously focusing on the sound, and it has the same structure as ordinary mindfulness meditation. The practice of noticing that your attention has wandered and returning it to the object is exactly the same.
The practice is simple. In a quiet place, close your eyes and listen to one piece from beginning to end with full attention. Direct your attention to the movement of the melody, the timbre of the instruments, and the changes in rhythm, and when your thoughts drift, bring your awareness back to the sound. Keeping this up for even 10 minutes a day gives you a feel for deliberately returning attention that has strayed. Music is also an excellent entry point to meditation, with the advantage of being easy to take up even for people who find meditation difficult.
Building a Music Prescription That Fits You
Because the effects of music vary greatly between individuals, it is important to build a "music prescription" that fits you. Start by preparing four playlists: one for lifting your mood, one for calming down, one for concentrating, and one for sleeping.
Put 5 to 10 pieces in each playlist and record how your mood changes when you actually listen to them. Over two to three weeks, swap pieces in and out to find the tracks that work best for your own emotions. Keeping a music diary makes it clear which pieces are effective in which situations, so that when you feel stressed you can immediately choose the right music. Music delivers its greatest effect when it is chosen to suit the individual, like a prescription.