The best resonator is the larynx. It is adjustable and has hard surfaces. Think of a tuning fork (the cords) vibrating and touching a plate (the larynx). The plate is forced to vibrate with the tuning fork due to its being in direct contact. The cords and larynx are similar to the tuning fork and plate in that the cords are housed within the larynx. They are in direct contact, with the closest of proximities. When this happens it is called forced resonance. The singer begins to have as a result the true “singer’s ring” in the voice that is indicative of much training.