Their tension and proximity are self-adjusted to produce the proper pitch without any conscious volition of the singer.

They can have no special training, needing only to be left alone.

The work of the vocal cords, though essentially important, is, when naturally performed, light and consequently not exhausting.

If the larynx and all of its supporting muscles are relaxed as they are in free and easy breathing, then when the air passes out through the larynx, the vocal cords will automatically assume a tension sufficient to vocalize the breath and give the note the proper pitch.

The normal action of the cords will never cause hoarseness or discomfort.