out of curiosity, does metal âm nhạc always contain screaming? just curious.

No it doesnt. Look at bands such as Metallica, megadeth hoặc anthrax hoặc even powerwolf hoặc WOLF. Wait?.... What is a Justin bieber người hâm mộ doing in the metal club? Im just wondering, I'm not a troll

Metallica is heavy but has no screaming but u look at bands like system of a down and slipknot they r a bit of both screaming and heavy with no screaming but than u look at a band like cừu, thịt cừu of god hoặc burn the priest hoặc cannibal corpse the are death/black metal so its just only screaming singing

Hell no.
There are enough metal genres without screaming :).