That's that crack music nigga
That real black music nigga
(That's that crack music nigga)
(That real black music nigga)

from Kanye West (Ft. Game) – Crack Music Lyrics on Rap Genius

Crack is considered a black person’s drug and hip-hop is considered black music due to its African origins.

A few years ago (IIRC) hip-hop overtook country as the most popular genre in America, so really he’s talking about hip hop music being addictive music for everyone.

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