Classically trained singers will tell you that screaming is the worst thing you can ever do to your vocal chords, but if you're into singing/screaming heavy metal or rock then it's necessary to know how to scream with minimal damage.
The correct way to scream is a technique called fry screaming, in which you control your vocal exhale using diaphragmatic breathing. Vocal fry is the noise you make when your vocal chords vibrate slowly.
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