In other cultures beyond the contemporary Euro-North American West, the voice plays a key part in "healing."
First Nations Pow Wow Singing (Loud Eagle Singers)
https://youtu.be/QecB8xqZlS0Mbuti Pygmy molimo songs:
https://youtu.be/3zdazJ0X1ncGregorian Chant as Healing:
The Cistercian Monks of Stift Heiligenkreuz: Gregorian Chant-- In Paradisum (from Latin mass)
https://youtu.be/XcP2YW5mhPg?list=PLcZbhzmvr7-FXSbIEWB89WH6T7cj72bsq