Quoting Bobby Busnach

“  I was one of the few white boys to hang out in the south bronx. In fact my nickname was white Robert. The truth is that the birth of hip hop came about because the boys who played in the playgrounds didn’t always take care of their records. And theyd skip some times cause they were scratched. Every once in a while someone would use the scratch and let it play as a groove. Also as a dj we were always trying to extend a break to make it last longer. As for rap, theyd extend the grooves and to break up the monotony would start to talk, which soon led to rymin and rappin. ”

Source: Bobby Busnach at Disco Patrick