how did Rap develope and how does it affect cultures?

sub questions:


Where did rap originate?
Do people shape the Rap/Hip-Hop culture or does the Rap/Hip-Hop culture shape the people?
What are different themes of rap music?
Is Mainstream rap destroying rap completly?
Which is more real Old School Rap or New School Rap?
How are different artist's lyrics similar?
How do different cultures look at Rap music?


some things i already know about rap music: i know that many artist rap about struggles, hate, love, self confindence, ect. Rap has also changed over the past ten years.