I´m a Finland based singing teacher and Phd student in the field of voice research. My research focuses on loud singing. If interested, check out my latest article in Journal of Voice: https://www.sciencedirect.com/science/article/pii/S089219972200025X. In this study we used MRI to examine three loud singing techniques in three female singers.
If you wan´t to know what vocal folds look like and how they behave in different types of singing, check out my other channel as well: https://www.youtube.com/channel/UC52Ol2sQUl0nntBCctgFA3g
