When people sing, their oxytocin (a feel-good hormone) goes up, and they tend to feel better—but their stress hormone (cortisol) doesn’t seem to change much, so maybe oxytocin is the real reason singing makes us happier.

A randomized controlled trial where participants are assigned to sing or sit quietly, with blood or saliva samples taken before and after to measure oxytocin and cortisol levels, and mood assessed using validated scales. The analysis would test whether oxytocin changes correlate with mood improvement more strongly than cortisol changes.

A longitudinal study tracking individuals over weeks of regular singing (e.g., choir participation), measuring oxytocin, cortisol, and mood at multiple time points to determine if consistent oxytocin increases predict mood improvement more reliably than cortisol decreases.

A crossover study where participants receive intranasal oxytocin or placebo before singing, and cortisol is measured alongside mood, to isolate whether oxytocin elevation alone enhances mood response to singing more than cortisol changes.

An analysis of naturally occurring singing behavior (e.g., singing in shower, car, or at events) with self-reported mood and salivary hormone levels collected in real time to assess whether oxytocin spikes correlate with mood boosts more consistently than cortisol drops.

A study using rodents exposed to vocalization stimuli mimicking singing, with oxytocin and cortisol measured alongside behavioral indicators of mood (e.g., sucrose preference, social interaction), to test if oxytocin blockade abolishes mood-like improvements.