Did you know that you have two sets of muscles that control your vocal cords?  One set is located in front and one in the back of your vocal cords!  These muscles open or close your vocal cords like zippers in order to create a certain pitch. The farther you go outside of your optimum pitch, the more delicate the balancing act is between the two. The more practice a vocalist has, the easier it is for them to find the balance and create the perfect pitch!