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

No it doesnt. Look at bands such as Metallica, megadeth oder anthrax oder even powerwolf oder WOLF. Wait?.... What is a Justin bieber Fan 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 lamm of god oder burn the priest oder cannibal corpse the are death/black metal so its just only screaming singing

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