If you want to be a good rapper with meaning behind your tracks like Kendrick then you have to be quite skilled. He tells stories. Or you can be a rapper like meek mill who basically just shouts into a microphone.
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It's probably requires more skill than screamo, screamo vocalists are like meek mill. They just scream into a mic.
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Yes, but one must able to scream well. There's a difference between screaming and screaming in a way that sounds good.