Whether you sing alone or with others, singing might help lower your stress hormones — so it’s the singing itself, not who you’re with, that could be calming your body.

A randomized controlled trial where participants are assigned to either group singing, individual singing, or a control activity (e.g., quiet reading), with saliva cortisol samples measured before and after a standardized 30-minute session, controlling for time of day, prior stress, and baseline cortisol.

A longitudinal study tracking habitual singers (group and individual) over 8 weeks, measuring cortisol levels at multiple time points to assess whether singing frequency correlates with sustained cortisol reduction, while controlling for lifestyle confounders.

A within-subject crossover design where each participant engages in both group and individual singing sessions (in random order), with cortisol measured before and after each to isolate the effect of social context.

An ecological momentary assessment study using wearable cortisol monitors and smartphone prompts to capture real-time cortisol and singing behavior in daily life.

A systematic meta-analysis pooling effect sizes from all published studies comparing cortisol levels after group singing, individual singing, and control conditions.