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

No it doesnt. Look at bands such as Metallica, megadeth o anthrax o even powerwolf o 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 cordero of god o burn the priest o cannibal corpse the are death/black metal so its just only screaming singing

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