Tbh I don't think there's lots of art in rap. Sometimes people come out with a really good angle on what they're talking about which pulls it towards storytelling or poetry but it's very very rare. Some guys can add a bit of signing in the mix which I'd say has more art rapping is usually "say those words in this allotted time" but signing is harder to decide how you're actually doing it. So most of it probably comes into the music production, video directing, live show production etc. to me.
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