Numerous books have been written about the origins of hip-hop and its evolution from an underground phenomenon to a global force. While its growth since the 1990s had been well-documented, here are ...

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In 2003, T.I. and other Atlanta rappers created new subgenre of rap: trap music. Twenty years later, its influence is everywhere. JUANA SUMMERS, HOST: About two minutes into the song, "Y'all Scared," ...