Cortisol And Music Therapy Research

Last updated: October 4, 2026 - Reviewed by Verdant Wellness Editorial Team

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By Gabriela Mitchell, Registered Dietitian (Linkedin)

Last Updated September 2026  ·  26 min read

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Real science on cortisol, stress, and sleep.

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A deep dive into the clinical evidence, study data, and open questions shaping this fast-moving field

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Table of Contents

• What Is Cortisol and Why Does It Matter in Music Therapy Research?
• How Music Affects the HPA Axis: The Biological Pathway
• What the Research Shows: Key Studies on Music Cortisol Reduction
• Recent Research From 2024 to 2026
• What Type of Music Supports healthy cortisol Most?
• Binaural Beats and Cortisol: A Separate Line of Evidence
• Measuring Cortisol: Saliva vs. Blood vs. Hair
• Music Therapy in Clinical Settings: Procedures, Hospitalization, and Anxiety
• The Meta-Analysis Problem: Why Results Are Inconsistent
• Frequently Asked Questions
• Summary and Takeaways

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What Is Cortisol and Why Does It Matter in Music Therapy Research?

Cortisol is a steroid hormone produced by the adrenal cortex. It is the body's primary biological marker of physiological stress, released in response to activation of the hypothalamic-pituitary-adrenal axis. When a person perceives a threat — whether physical, psychological, or emotional — the hypothalamus signals the pituitary gland, which then signals the adrenal glands to release cortisol into the bloodstream. This is a survival mechanism, and in short bursts it is entirely healthy and adaptive.

The problem arises with chronic or disproportionate cortisol elevation. Sustained high levels of this music stress hormone are associated with immune suppression, cardiovascular strain, metabolic disruption, memory impairment, sleep dysfunction, and mood disorders including anxiety and depression. In clinical and research contexts, cortisol has become one of the most widely used objective biomarkers of stress precisely because it is measurable, reproducible, and tightly linked to a well-understood biological pathway.

This is why cortisol and music therapy research has grown so substantially over the past two decades. If a therapeutic intervention can measurably support healthy cortisol, that is strong physiological evidence — not just self-reported perception — that something real is happening in the body. For researchers, clinicians, and patients alike, the question of whether music therapy actually moves the needle on cortisol is both scientifically significant and practically important.

To understand the research, it helps to first understand the HPA axis and how auditory stimuli interact with it.

How Music Affects the HPA Axis: The Biological Pathway

The relationship between music HPA interactions is more biologically complex than many popular articles suggest. When you listen to music, auditory signals travel through the cochlea, up the auditory nerve, through the brainstem, and into multiple cortical and subcortical regions simultaneously. Those regions include the limbic system — which governs emotion, memory, and motivation — as well as the prefrontal cortex, which plays a central role in emotional regulation.

The limbic system, and in particular the amygdala and hippocampus, has direct connections to the hypothalamus. When music activates these regions in ways that promote positive affect, emotional safety, or relaxation, it can reduce the signaling load on the hypothalamus. Less hypothalamic activation means less corticotropin-releasing hormone (CRH), which means less adrenocorticotropic hormone (ACTH) from the pituitary, which ultimately means support healthy cortisol output from the adrenal cortex. This is the proposed biological mechanism through which music therapy HPA modulation occurs.

There is also a secondary pathway involving the autonomic nervous system. Music — particularly slow-tempo, harmonically consonant, and rhythmically predictable music — activates the parasympathetic nervous system, the "rest and digest" branch that counteracts the sympathetic "fight or flight" response. Parasympathetic activation is associated with reduced heart rate, lower blood pressure, and suppression of the HPA stress response. This dual-pathway model, involving both the limbic-HPA connection and the autonomic nervous system, is the dominant theoretical framework in cortisol and music therapy research.

What is less settled is exactly how much this mechanism translates into measurable cortisol changes across diverse populations, intervention types, and clinical contexts. That is where the research literature becomes nuanced — and sometimes contradictory.

What the Research Shows: Key Studies on Music Cortisol Reduction

The Pediatric Oncology Study (2020)

One of the most-cited studies in this field examined music therapy cortisol effects in children with leukemia during IV-line insertion, a procedure that is acutely distressing for pediatric patients. The study, published in a peer-reviewed journal and indexed at PubMed Central, measured salivary cortisol before and after a music therapy intervention delivered during the procedure.

The results were noteworthy for what they did not show. While median salivary cortisol moved from 4.14 to 3.47 — a modest numerical decrease — this change was not statistically significant, with a reported p-value of 0.99. This is a striking null result, particularly because the intervention was delivered at a genuinely stressful moment and in a vulnerable population. The music cortisol study suggested that for acute procedural stress in this context, music therapy alone may not produce a detectable HPA-axis response at the group level.

This does not mean the intervention was without value. Behavioral pain and distress outcomes may have shown different patterns. But as a direct measure of music cortisol reduction in a controlled medical setting, the data were unconvincing.

The Chemical Dependency Study (2019)

A 2019 study published through PMC took a different approach. It examined a single 60-minute group music therapy session in people who were chemically dependent and found that the session was associated with a reduction in stress as measured by salivary cortisol. This study added to a growing body of evidence suggesting that music therapy cortisol effects may be more detectable in populations with elevated baseline stress, or in contexts involving longer, more immersive sessions rather than brief procedural interventions.

The group format may also have been a contributing factor. Social connection, shared musical experience, and the interpersonal dimensions of group therapy are all stress-reducing in their own right, making it difficult to isolate the specific music component. Nevertheless, the cortisol data supported the claim that something physiologically meaningful occurred.

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Population Differences and Contextual Variability

Reading across these early studies, one pattern becomes clear: music anxiety cortisol relationships are highly context-dependent. The same basic intervention — listening to or participating in music — can produce very different cortisol outcomes depending on:

• The baseline stress level of the participant. People with elevated cortisol may show larger drops simply due to regression to the mean.
• The nature of the stressor. Acute procedural stress is biologically different from chronic psychological stress.
• The type of music used. Researcher-selected versus patient-selected music may activate different neural reward and relaxation pathways.
• Session length and format. A 20-minute passive listening session differs profoundly from a 60-minute active music therapy engagement.
• The timing of cortisol measurement. Cortisol follows a circadian rhythm, and measurement timing relative to the session and to awakening dramatically affects baseline and post-intervention values.

These variables are exactly why the field has struggled to produce consistent results — and why the most recent meta-analytic evidence is so important to examine carefully.

Recent Research From 2024 to 2026

The past two years have produced some of the most methodologically rigorous work in the field, and the findings cut in multiple directions.

2024: Wound Healing and Cortisol

A 2024 study published in the International Wound Journal reported a significant decrease in cortisol in the experimental group compared with the control group after one month of music intervention. This is an important finding for several reasons. First, the one-month timeframe suggests that sustained or repeated music interventions may produce effects that a single session does not. Second, the wound healing context is physiologically interesting: cortisol suppresses immune function and impairs tissue repair, so if music therapy supports healthy cortisol in this population, it could have downstream clinical effects on healing outcomes.

The study adds to a pattern in the music cortisol literature: repeated, sustained interventions across days or weeks may be more likely to produce significant cortisol reductions than single-session designs.

2025: Sound Interventions and Stress Physiology (JMIR Mental Health)

The 2025 JMIR Mental Health study provides one of the most comprehensive recent examinations of how different sound interventions affect physiological stress markers. The study found that all groups showed cortisol decreases across conditions, but that music — specifically classical music and self-selected pieces — was particularly effective at reducing physiological stress markers including cortisol. Soothing music cortisol associations were strongest when participants had control over what they listened to and when the music had personal emotional resonance.

Importantly, the study also measured anxiety (using validated self-report instruments), systolic blood pressure, and cortisol simultaneously, allowing researchers to examine whether psychological and physiological markers moved together. They generally did, strengthening the case for a genuine HPA-mediated mechanism rather than a reporting bias.

The finding that self-selected music outperforms researcher-selected music in cortisol reduction has significant practical implications for clinical implementation. It suggests that personalization is not merely a patient satisfaction consideration — it may be biologically meaningful.

2025: Music Therapy in Children and Adolescents with Autism Spectrum Disorder

A 2025 pilot study published in ScienceDirect examined music listening therapy in children and adolescents with autism spectrum disorder, using cortisol and DNA damage as biological outcome measures. Elevated cortisol is common in ASD and is associated with heightened physiological stress reactivity, sensory sensitivity, and behavioral dysregulation.

The decision to include DNA damage as a co-outcome alongside cortisol is scientifically interesting. Chronic cortisol elevation is associated with oxidative stress, which can cause DNA damage. If music therapy supports healthy cortisol, it might — over time — also reduce oxidative stress markers. This study was a pilot, so the sample sizes and conclusions are preliminary, but it represents an important expansion of what music stress hormones research is measuring.

2026: Frontiers in Human Neuroscience

A 2026 paper in Frontiers in Human Neuroscience reported lower salivary cortisol in the music group compared with the control group after three interventions, with a statistically significant between-group difference at p = 0.0184. This result is clinically and statistically meaningful. The p-value is below the conventional 0.05 threshold, the design involved multiple sessions rather than a single exposure, and the salivary cortisol measurement approach allowed for non-invasive longitudinal tracking.

This study adds to the evidence that repeated music interventions across sessions accumulate a physiological effect, which a single-session design would miss.

2026: The Meta-Analysis That Changed the Conversation

Arguably the most important recent development in cortisol and music therapy research is a 2026 systematic review and meta-analysis that found no significant pooled cortisol effect overall. Cortisol was identified as the only biomarker with enough data across included studies for a meaningful pooled analysis — itself a telling indicator of how much the field has converged on this measure. The pooled standardized mean difference was -0.18, with a 95% confidence interval of -0.96 to 0.59, meaning the interval crossed zero and the effect was not statistically significant.

Critically, the heterogeneity was extremely high: I² = 88.7%. This figure tells us that roughly 89% of the variance in effect sizes across studies was due to differences between studies rather than random sampling error. In practical terms, this means the studies are measuring something real, but that "something" is highly dependent on study-specific factors — population, intervention type, comparator, measurement timing, and clinical context.

Individual studies show cortisol reductions. The pooled estimate does not. This is the central tension in the field, and it is not resolved by dismissing either finding.

What Type of Music Supports healthy cortisol Most?

This is one of the most common reader questions about music therapy science, and the research gives a nuanced answer. Based on available evidence, several factors appear to matter more than genre alone:

Tempo and Rhythm

Slow-tempo music — generally 60 to 80 beats per minute — is consistently associated with reduced physiological arousal. This tempo range approximates resting heart rate and may entrain cardiac and respiratory rhythms through a process called physiological synchrony. Studies on soothing music cortisol effects frequently use slow, sustained music as the active condition, and this appears to be a meaningful variable.

Harmonic Complexity and Consonance

Music that is harmonically consonant (uses intervals that sound stable and resolved) tends to reduce arousal compared with dissonant music. Classical compositions in major keys with predictable harmonic progressions are frequently used in research precisely because they minimize acoustic surprises that might trigger an orienting or startle response.

Personal Resonance and Familiarity

The 2025 JMIR study and other recent work strongly suggest that self-selected and personally meaningful music produces stronger cortisol reductions than researcher-selected music. Familiar music activates reward circuitry and autobiographical memory networks that engage the limbic system in a positive direction, potentially producing stronger HPA inhibition than unfamiliar music, regardless of genre.

Classical Music: A Special Case

Classical music — particularly pieces with slow tempos, minimal lyrics, and predictable structure — appears repeatedly in music cortisol study designs as an effective intervention. The 2025 JMIR findings specifically highlighted classical music as among the most effective options in their multi-condition comparison. This may be partly because classical music satisfies multiple criteria simultaneously: appropriate tempo, consonant harmony, predictable structure, and an absence of linguistic content that might engage effortful cognitive processing.

Nature Sounds and Hybrid Interventions

Some studies examine nature sounds (rainfall, running water, birdsong) as part of broader sound intervention research. While not strictly music, these stimuli often produce similar cortisol and HPA responses to slow, consonant music, which suggests the underlying mechanism may be acoustic rather than specifically musical.

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Binaural Beats and Cortisol: A Separate Line of Evidence

Binaural beats cortisol research occupies an interesting niche within the broader music and stress physiology literature. Binaural beats are an auditory phenomenon created when two slightly different frequencies are presented separately to each ear — for example, 200 Hz in the left ear and 210 Hz in the right — producing the perception of a third, pulsing tone at the difference frequency (10 Hz in this example). Proponents argue that this entrains brainwave activity to desired frequency bands: delta (sleep), theta (meditation and relaxation), alpha (calm alertness), or beta (active cognition).

The theoretical link between binaural beats cortisol reduction and HPA-axis modulation runs through cortical entrainment: if binaural beats reliably shift EEG activity toward slower frequencies associated with relaxation, this could reduce sympathetic nervous system activation and secondarily suppress cortisol output.

The evidence is still developing. Some studies have shown cortisol reductions following binaural beats protocols, particularly those targeting theta and alpha frequencies. Others have not. Methodological challenges include the difficulty of blinding participants to the active condition, wide variability in protocol design (frequency, duration, carrier tones), and the absence of large-scale randomized controlled trials with objective cortisol endpoints.

What binaural beats cortisol research does share with the broader music therapy literature is the same pattern of heterogeneity: some studies show effects, others do not, and the characteristics of studies that do find effects (longer sessions, lower baseline arousal, theta-range frequencies) are not consistent enough to support firm clinical recommendations. The field is nonetheless actively generating evidence, and binaural beats represent a plausible mechanistic pathway worth continued investigation.

Measuring Cortisol: Saliva vs. Blood vs. Hair

A practical but often underappreciated dimension of cortisol and music therapy research is the measurement method. The way cortisol is collected fundamentally shapes what can be concluded from a study.

Salivary Cortisol

Salivary cortisol is the most commonly used measure in music therapy studies, and for good reason. It is non-invasive, can be collected without causing additional stress (unlike blood draws), and reflects free (biologically active) cortisol rather than total cortisol. Participants can collect saliva samples using passive drool or absorptive swabs, making the method practical even with pediatric populations or people in distress.

The limitation is variability. Salivary cortisol is sensitive to time of day (the cortisol awakening response means levels are highest in the first 30 to 45 minutes after waking), oral food and drink intake, physical activity, and individual biological variation. Studies that do not carefully control these variables introduce noise into their cortisol measurements that can obscure real effects or create the appearance of effects that are not there.

Blood (Serum or Plasma) Cortisol

Serum cortisol measures total cortisol and is highly accurate, but the procedure of venipuncture is itself a stressor that activates the HPA axis and elevates cortisol. This creates a fundamental methodological problem in music therapy research: using blood draws to measure stress hormone reduction requires controlling for the cortisol spike caused by the blood draw itself. Some researchers use indwelling catheters inserted well before measurement to address this, but this adds procedural complexity.

Hair Cortisol

Hair cortisol provides a retrospective window into HPA activity over weeks to months. Because cortisol is incorporated into the hair shaft as it grows (approximately 1 cm per month), measuring cortisol in a segment of hair gives an integrated picture of cortisol output over that period rather than a snapshot. This is valuable for studies examining whether sustained music therapy programs reduce chronic stress, but it cannot capture acute session-to-session changes.

Implications for Interpreting the Research

The 2026 meta-analysis noted that cortisol was the only biomarker with sufficient data for pooled analysis, and much of that data came from salivary measurement. The high heterogeneity (I² = 88.7%) reflects not only genuine differences in intervention effectiveness across populations but also real methodological variation in how cortisol was collected, timed, and analyzed. Standardization of measurement protocols is one of the most important next steps for the field.

Music Therapy in Clinical Settings: Procedures, Hospitalization, and Anxiety

For clinicians and patients, the most practically relevant question is whether music therapy cortisol effects are meaningful in real-world medical and psychological settings. The evidence across several clinical contexts provides a useful picture.

During Medical Procedures

The 2020 leukemia study showed no significant salivary cortisol change during IV-line insertion, despite the procedure being demonstrably stressful. This finding aligns with other null results from procedural settings, where the acuity and brevity of the stressor may overwhelm any HPA modulation that music can produce. The cortisol response to an acute painful procedure is steep, fast, and partly reflexive — a slower-acting intervention like music listening may simply not be sufficient to prevent or meaningfully blunt the initial HPA activation.

However, music may still support healthy cortisol in the post-procedural recovery period, when the acute stressor has passed but the HPA axis remains activated. This timing distinction is important for study design: measuring cortisol only during a procedure versus during recovery may yield different results.

During Hospitalization and Palliative Care

Prolonged hospitalization is associated with sustained cortisol elevation due to environmental stress, disrupted sleep, pain, uncertainty, and loss of control. Music therapy delivered repeatedly over the course of a hospital admission — rather than as a single session — may be more likely to produce meaningful cortisol reductions by consistently activating the parasympathetic response over time. The 2024 wound healing study and the 2026 Frontiers paper, both involving multiple sessions, support this hypothesis.

In Mental Health and Addiction Settings

The 2019 chemical dependency study suggests that music therapy cortisol effects may be strongest in populations where chronic stress and HPA dysregulation are already present. People in recovery from chemical dependency often have significantly elevated baseline cortisol due to the physiological effects of chronic substance use, withdrawal, and psychosocial stress. Music therapy in this context may work partly by providing a reliable, non-pharmacological pathway to HPA down-regulation, offering a form of stress modulation that supports recovery without substance use.

In Anxiety Disorders

Music anxiety cortisol connections are particularly studied in clinical anxiety populations. Generalized anxiety disorder, PTSD, and social anxiety all involve dysregulated HPA activity and elevated basal cortisol. Music interventions in these populations have shown mixed results, partly because anxiety disorders involve complex neurobiological changes in HPA feedback sensitivity that a behavioral intervention alone may not fully address. Nevertheless, adjunctive music therapy — combined with established psychological treatments — may provide additive HPA benefits, particularly when used between formal sessions to maintain support healthy cortisol levels.

The Meta-Analysis Problem: Why Results Are Inconsistent

The 2026 meta-analysis revealing no significant pooled cortisol effect (SMD = -0.18; 95% CI -0.96 to 0.59; I² = 88.7%) is a sobering finding that deserves careful interpretation rather than dismissal.

What the Numbers Actually Mean

A standardized mean difference of -0.18 is a very small effect size by conventional benchmarks (Cohen's d < 0.2 is considered small to trivial). The 95% confidence interval crossing zero means we cannot rule out that the true average effect is zero or even slightly positive (i.e., that music therapy might slightly increase cortisol in some average-case scenario). This does not mean music therapy does not work on cortisol in specific contexts — the individual studies showing significant reductions are real data. It means that on average, across all studied contexts, we cannot claim a reliable cortisol-reducing effect.

The I² Problem

The I² of 88.7% is the critical figure. In meta-analysis, I² represents the proportion of variability in effect sizes attributable to heterogeneity (true differences between studies) rather than chance. Values above 75% are generally considered high, and 88.7% is very high. This means that asking "does music therapy support healthy cortisol?" may be the wrong question. The better question is: "Under what specific conditions, in which specific populations, with what specific intervention parameters, does music therapy produce meaningful cortisol reductions?"

Why Individual Studies Show Effects

The fact that individual studies — including the 2026 Frontiers paper (p = 0.0184) and the 2024 wound healing study — show significant between-group cortisol differences is not contradicted by the meta-analysis. High heterogeneity means the effect is real but highly variable. Studies with specific characteristics (multiple sessions, populations with elevated baseline cortisol, self-selected music, appropriate measurement timing) tend to find effects. Studies without these characteristics tend not to. A pooled estimate that ignores this variability produces a null finding that reflects averaging across very different situations, not the absence of any effect.

What This Means for Future Research

The field needs studies specifically designed to identify the moderating variables that predict when music therapy will and will not produce cortisol reductions. Pre-registered trials with larger samples, standardized cortisol measurement protocols, and careful characterization of intervention parameters would allow future meta-analyses to move beyond the current impasse.

Frequently Asked Questions

Does music therapy support healthy cortisol?

Sometimes, and under specific conditions. Individual studies — including a 2026 Frontiers study showing significant between-group differences (p = 0.0184) and a 2024 wound healing study showing significant reductions after one month — demonstrate that music therapy can measurably support healthy cortisol. However, a 2026 meta-analysis found no significant pooled effect overall (SMD = -0.18; 95% CI -0.96 to 0.59), with very high heterogeneity. The honest answer is that music therapy supports healthy cortisol in some populations, contexts, and intervention formats — but not universally or predictably.

What type of music supports healthy cortisol most?

Current evidence suggests that slow-tempo (60–80 BPM), harmonically consonant, familiar, and personally meaningful music produces the strongest cortisol reductions. A 2025 JMIR Mental Health study specifically highlighted classical music and self-selected pieces as the most effective options across multiple sound intervention conditions. The self-selection finding is particularly important: music that the listener chooses and finds emotionally meaningful appears more effective than researcher-prescribed music, regardless of genre.

How long does a music therapy session need to be to affect cortisol?

The research does not support a single definitive answer, but a pattern is emerging. Single sessions as short as 20 to 30 minutes have produced cortisol changes in some studies, but the most robust effects appear in studies using repeated sessions over days or weeks. The 2024 wound healing study measured significant cortisol differences after one month. The 2026 Frontiers paper found effects after three sessions. Single acute sessions in procedural settings (like the 2020 IV-line study) often fail to produce significant changes.

Is the cortisol effect measurable in saliva or blood?

Most music cortisol studies use salivary cortisol because it is non-invasive, reflects free (active) cortisol, and can be collected without creating additional stress. Blood cortisol measures total cortisol and is highly accurate but requires venipuncture, which is itself a stressor. Hair cortisol offers a retrospective view over weeks to months and may be particularly useful for evaluating sustained music therapy programs. Salivary measurement is the dominant method in the field, though its variability is a recognized limitation.

Does music therapy work better in healthy people or clinical patients?

Evidence leans toward stronger cortisol effects in clinical populations with elevated baseline cortisol. People with chronic psychological stress, addiction, medical illness, or anxiety disorders often show larger absolute decreases because their starting point is higher. The 2019 chemical dependency study, the 2025 ASD pilot, and the 2024 wound healing research all worked with populations carrying meaningful physiological stress burdens. The 2020 leukemia study, despite working with a distressed population, found no significant effect during an acute procedural stressor — suggesting it is chronic rather than acute stress states where music therapy HPA effects may be most detectable.

What does the research say about music therapy for stress hormones overall?

The research is mixed but not discouraging. Multiple well-designed studies show real cortisol reductions under specific conditions. The 2026 meta-analysis provides important context: the overall effect is small and inconsistent, but this reflects high variability between studies rather than the absence of any effect. The field is moving toward understanding which specific conditions produce cortisol benefits, which is a more productive frame than asking whether music therapy "works" as a universal cortisol intervention.

Is there evidence from randomized controlled trials?

Yes, though the quality and rigor of RCTs varies considerably. The 2026 Frontiers paper, the 2024 wound healing study, and several studies included in the 2026 meta-analysis used controlled designs with comparison conditions. The 2020 pediatric leukemia study was a controlled music cortisol study that produced a null result. RCT evidence exists, but methodological heterogeneity — particularly in cortisol measurement protocols and intervention standardization — limits what can be concluded from aggregating across them.

Are results consistent across studies, or do they vary by population and intervention?

They vary substantially. The I² of 88.7% in the 2026 meta-analysis quantifies exactly how inconsistent results are across studies. Population characteristics, intervention format, session length, music type, baseline cortisol levels, clinical context, and measurement methodology all appear to moderate outcomes. This heterogeneity is not a failure of the science — it is a finding in itself, pointing toward the moderating variables that future research should systematically investigate.

Can music therapy help during procedures, hospitalization, or anxiety-provoking events?

For acute procedures, the cortisol evidence is weak: the 2020 IV-line insertion study found no significant salivary cortisol change during the procedure. For repeated sessions during hospitalization, the evidence is more promising, with multiple-session designs showing measurable cortisol reductions. For chronic anxiety-provoking situations, a 2025 study found that classical and self-selected music reduced cortisol alongside anxiety and blood pressure. Music therapy during procedures may provide behavioral and emotional benefits even when cortisol effects are not measurable.

What studies were published in 2024 to 2026?

Key recent publications include: a 2024 International Wound Journal study showing significant cortisol reductions after one month of music intervention; a 2025 JMIR Mental Health study on sound interventions and stress physiology highlighting classical and self-selected music; a 2025 ScienceDirect pilot on music listening therapy in children with autism and cortisol outcomes; a 2026 Frontiers in Human Neuroscience paper showing lower salivary cortisol after three music sessions (p = 0.0184); and a 2026 systematic review and meta-analysis finding no significant pooled cortisol effect (SMD = -0.18; I² = 88.7%). Collectively these studies represent significant recent progress in understanding both what music therapy can and cannot do for cortisol.

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Summary and Takeaways

The science of cortisol and music therapy research is at an inflection point. The foundational hypothesis — that music can support healthy cortisol by modulating the HPA axis through limbic and autonomic pathways — is biologically plausible and supported by the architecture of the central nervous system. Some individual studies confirm it. Others do not. And the most comprehensive pooled analysis to date finds no significant average effect, but with a degree of heterogeneity that makes averaging across studies scientifically suspect.

Here is what the current evidence actually supports:

Music cortisol effects are real but conditional. They appear most reliably when music interventions are repeated across multiple sessions, when participants have elevated baseline cortisol, when music is self-selected and personally meaningful, and when measurement protocols are appropriate for the research design.

Soothing music cortisol relationships are strongest with specific acoustic features. Slow tempo, harmonic consonance, predictable structure, and personal relevance are the most consistently associated characteristics of music that produces cortisol reductions.

The music HPA axis connection is better established theoretically than empirically. The biological pathway through which music modulates the HPA axis is well-described and internally coherent. But translating that mechanism into reproducible, clinically significant cortisol changes across diverse populations and settings has proven more challenging than early enthusiasm suggested.

The music therapy HPA literature needs methodological standardization. Salivary cortisol measurement protocols vary enormously across studies, creating noise that makes aggregation difficult. Future high-quality research should pre-register designs, standardize measurement timing relative to awakening and session delivery, and use consistent assay methods.

Single studies showing effects are not wrong, and neither is the meta-analysis. Both are telling part of a complex story. The binaural beats cortisol literature, the ASD pilot data, the wound healing findings, and the Frontiers paper are each addressing specific questions in specific contexts. The meta-analytic null finding reflects the failure of those contexts to average to a consistent answer — which is itself a meaningful scientific result.

For practitioners, the most defensible position is to continue using music therapy for its evidence-supported behavioral and psychological benefits — reduced anxiety, improved mood, better pain tolerance, enhanced engagement with care — while being transparent with patients and colleagues that the cortisol evidence, while promising in specific contexts, is not yet strong enough to claim reliable HPA-axis modulation as a universal effect.

For researchers, the field needs theoretically grounded moderator analyses, standardized measurement protocols, and well-powered studies designed specifically to test boundary conditions: when does music therapy change cortisol, and when doesn't it? That is the question the next decade of music cortisol research is positioned to answer.

References

1. Music therapy in children with leukemia during IV-line insertion. PMC. 2020. https://pmc.ncbi.nlm.nih.gov/articles/PMC7336003/
2. Group music therapy and salivary cortisol in chemical dependency. PMC. 2019. https://pmc.ncbi.nlm.nih.gov/articles/PMC6336358/
3. Sound interventions and physiological stress markers. JMIR Mental Health. 2025. https://mental.jmir.org/2025/1/e69120/PDF
4. Music listening therapy in autism spectrum disorder: cortisol and DNA damage. ScienceDirect. 2025. https://www.sciencedirect.com/science/article/abs/pii/S3050656525000963
5. Systematic review and meta-analysis of music therapy cortisol effects. PubMed. 2026. https://pubmed.ncbi.nlm.nih.gov/42365603/
6. Music therapy and cortisol in wound healing. International Wound Journal. 2024. https://onlinelibrary.wiley.com/doi/full/10.1111/iwj.14790
7. Salivary cortisol in music vs. control group after three sessions. Frontiers in Human Neuroscience. 2026. https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2026.1730014/full