The rough sound comes from above the vocal cords
In ordinary speech, the true vocal folds—two small bands of tissue in the larynx—vibrate as air passes between them. Some harsh metal vocals add another source of vibration: the ventricular folds, sometimes called false vocal folds, which sit just above the true ones. Airflow can set these upper folds vibrating, creating a coarse, rattling sound without requiring the singer to force the true folds into a scream.
The result is not simply louder speech. The added vibration gives a growl its noisy, distorted quality, while the singer still shapes the sound with the throat, mouth, and tongue.
Control matters more than brute force
A convincing growl may sound violent, but producing it safely depends on coordination, not just pushing harder. Singers learn to manage airflow and find a configuration that makes the desired structures vibrate without painful squeezing. Different harsh-vocal styles use different combinations of structures, so ventricular-fold vibration is one method, not a universal explanation for every metal scream.
The sound can also feel unfamiliar at first: it is made with a different balance of airflow and vibration than ordinary singing. Because strain and pain can signal that something is wrong, technique and gradual practice matter; a harsh sound by itself does not prove that the voice is unharmed.
Why the voice can sound wrecked without being shouted
In a recording, distortion masks the fine details of how the sound is produced. What reaches the listener is a deliberately rough timbre, not necessarily the uncontrolled tearing quality its name suggests. The key distinction is between creating a rough sound through controlled vibration and forcing the voice until it hurts. That is how a growl can sound like a vocal cord catastrophe while relying on a different source of vibration above the true folds.
