Resonance with a domino effect can occur in a group where one of the participants sings themselves free. The singer expresses an emotion that is awakened by making contact with a specific trauma.
The vocal frequency of the emotion can resonate with others who have a similar trauma, move it to wake up and become alive again.
Thus, even grave traumas, which a person has no connection to, can come alive, when they experience another participant singing her/himself free. As a passive listener you experience your trauma begin to move, when you feel deeply touched and maybe inclined to weep without any explanation. In some cases physical reactions might appear such as nausea, and/or the body reacts by wanting to twist itself into place through movements you have no control of.