I am in search of studies, papers, or essays that highlight empirical evidence of Gregorian Chant’s healing qualities; whether that be physiological, emotional health, or otherwise. I am looking for both evidence of those simply listening to and those actively engaged in singing. Thank you in advance for anything you might be willing to share.
I'm not aware of anything personally. But there is a whole new field of research under the umbrella of "Music Therapy." I imagine digging through sources in that field, and contacting folks at universities in such titled departments, might get you going in the right direction.
I was referring to a story I first came across in a Joscelyn Godwin book, but I can’t remember that original source at the moment.
You can probably find plenty of stuff (on a whole spectrum of new age to orthodoxy) online on sound healing and the like; to keep it grounded in the Church, it might be worth investigating the opinion that Gregorian chant is a sacramental. Along those lines, I suggest Dom Hourlier’s little book on the spirituality of chant.
You might find Peter Kwasniewski's recent book helpful: Good Music, Sacred Music, and Silence.
The first few chapters are devoted to a philosophical analysis of the characteristics of different genres of music and what makes music beautiful and nourishing. Here is a screengrab of the beginning of the table of contents:
That's from the Amazon link, at which you can conveniently read the first 2.5 chapters as free samples to determine whether you want to purchase the book:
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