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Listen to lots of rap. If you want to rap, you've got to immerse yourself in the culture and the sounds of hip-hop and rap music. It's a style of music deeply ingrained in city life and culture. Find an artist you like and trace their influences back to get some sense of the foundation of hip-hop and develop your knowledge of the style. Listen to popular rap artists, listen to underground artists, listen to old-school rappers, listen to Nas.
Listen to the music of different regions: listen to New York-style "boom-bap" hip-hop, West Coast gangsta rap, Dirty South chopped-and-screwed rap, and also the hip-hop of the underground. Listen to the music in your region.
Contemporary rap music is linked to mixtape culture.[1] An online version of the old-school mixtapes is available at record stores, most rappers album-quality material is available for free download as a promotional tactic. Check out your favorite rapper's mixtapes and branch out. It's free, so you can listen to stuff you might not even like and form an opinion about it.