Many singers tend to sing with a tensed jaw. It gives them the feeling that they have control over the sound. The opposite is true because there are many muscles that connect the jaw and the throat. Some of them pass your larynx. When these muscles are tensed, they will put pressure on your larynx and prevent your larynx from moving freely.
The concept of an “open throat” when singing may be baffling for new and aspiring singers. Read more at: <a href="http://tips.how2improvesinging.com/open-throat-infographic/" rel="nofollow" target="_blank">tips.how2improves...</a> .