Actually I’m not a big hip-hop fan, but some musicians can’t be missing here. Proverb is a popular South African rapper, who started rapping in 1999 and doesn’t use vulgar language. In his track called “Stop Think“, he spreads many messages, like “education and knowledge goes of the keys that I open the door[…], stop and think how serious this is”
World Music - the Music Journey 
I agree, I’m not a rapper fan but there is a place for it, especially if it has a positive message :)
yeah, that’s the best in rap, the messages are often easy to understand ;)