To be honest, I think Ro is indulging in a little rhetorical exaggeration  I suspect horror-core is a lot closer to hip-hop than death metal is to Brahms or Mozart.
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Despite Ro's characterization, I think horror-core may be more like hip-hop than death metal is like Mozart.
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Personally, I think Ro is spot on when he says that horror-core is nothing like hip-hop.