How did rap music start of?

Rap Started in the West Bronx by "Kool Herc" (credited with being the first rapper)

in 1970s. When Disco Music Djs would Say something like " you guys ready to party?' or something along those lines. But when a MC did that well The DJ did his Thing People didnt like it so the DJ and MC took it Some where else. than kids just started making there own music, Rap.