Vocal practice can be a way to heal emotional trauma. Emotional trauma can be healed faster by learning to sing better. You have to learn to feel the air as it moves through the voice and connect and surrender to the feeling of the vibration. If you are delicate enough with the process, it can unravel unconscious emotions trapped in the body. It is way faster than therapy.
That is one of the incredible gifts of a life in the arts. If you want to show up and be totally present, you have to clear any emotional stuff in the way of a free expression.