Why was rock and roll developed?

please help it would be greatlyy appreciated i have to write a 3 page report discussing this question... what is the reason why rock and roll was developed, and what led to this?|||Rock and roll is the language of rebellion. It started (and ended) as a way to speak out for what people believed in/were against. this melted into several angry punk bands later, but the main point of it was to rebel.|||evolved up from jazz in the spirit of rebellion. introduced more use of the guitar which is where i think the rock-rap split happened|||I don't think it was "developed" from anything really. It more or less evolved from other genres like blues and jazz.|||definitely evolved from blues. it's nonconformist music|||Global warming.|||it was developed so that we could have a way of sticking it to the man