A book about the history or current context of rap/hip-hop

I would love to learn more about the history of rap and hip-hop (e.g., notable rappers that influenced the genres, notable rivalries, East coast vs. West coast, etc.), the cultural context that influenced the music (and how the music influenced the culture), or the current state of the industry. I recently read Rollie Pemberton's Bedroom Rapper that got me interested in the subject, as did Kendrick Lamar's half-time show. I'm open to non-fiction or fiction!