In vocal pedagogy, there is often deep discussion regarding the muscles involved in singing—specifically the vocal cords and the muscle systems that draw them into tension, such as the arytenoids and crico-thyroids. This focus is well-placed; without these muscles opening, closing, and adjusting, we wouldn't have a voice. We would simply have a "whoosh" sound, similar to air escaping from a tire.
However, moving muscle is only one half of the equation. That which we call "voice" is also moving air. Without moving air, the vocal cords would not open or close in the rhythmic way required for song. In fact, the cords move in direct response to the cycle of respiration (just as they close instinctively when we eat to protect the lungs). Without the "wind" of our breath, the "strings" of our vocal folds would never vibrate.
The true magic of singing happens when electrical "mental" energy from our brains sends signals to the muscles to contract, coinciding perfectly with the movement of air. This combination of thought and aerodynamic force causes the vocal cords to vibrate. How we adjust those cords—tuning them for specific pitches, volumes, and vowels—is what transforms raw air and thought into beautiful sound.
Nothing in the vocal mechanism works in isolation. The air, the muscles, and the mind work together in a delicate, sophisticated harmony. By understanding this relationship, a singer can move away from "forcing" a sound and toward "allowing" the coordination to take place. When thought and air meet at the vocal cords, the result is a voice that is free, resonant, and uniquely yours.