"We're seeing biological effects that actually mirror what we're seeing in the psychological and emotional testing," a Tenovus Cancer Care researcher said.
Saliva samples were taken from almost 200 people affected by cancer before and after about an hour of choir rehearsal.
Samples taken after a choir rehearsal showed lower levels of the stress hormone cortisol, and a boost in immune proteins.
Participants in the study had cancer, cared for someone with cancer or mourned the death of someone with cancer.
An upcoming study will evaluate the long-term effects of choral singing on people affected by cancer.
This video includes clips from Tenovus Cancer Care.