I am a professional rapper and I do it for a living, its fun, What would you like to know about it? 
What are the origins of rap?
Rap started the same time that Hip hop did, It developed in the Bronx in New York City during the late 1970s.
Do you rap acapella?
I do sometimes, But I like a good rhythm to go along with my words so I can keep on tempo with everything. 
Is rapping considered a form of poetry?
Well Rap usually differs from spoken-word poetry,  rap is usually more performed in time to a track of music..
I see. Who are some of your favorite rappers? The only one i'm familiar with is Tupac.
I like Kendrick Lamar, Although he didnt get recognition until 2010, after he released his first album  "Overly Dedicated".