Steven Siler, Dove Award winning songwriter, singer and founder of Music for the Soul, says this about music.
“In this day and age there seems to be very few concepts upon which we can all agree. I’d like to suggest that there are two important, timeless realities upon which we can all agree. First, that all human beings have a deep desire to know that they are not alone. Second, music has the unique ability to speak to us in a way that connects us to our deepest emotions and helps us to express the inexpressible. What is the power of a song? It is an agent of life changing healing for those dealing with issues of trauma, grief, and other disruptive life events.”
From a scientific perspective, music can be used to help bring the body into a state of relaxation, activating the parasympathetic nervous system (this helps with resting and digesting), and deactivating the sympathetic nervous system (fight, flight, or freeze) response. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5744879/