What are the origins of Rock and Roll dance?

There is a basic beat to the music. Pick up on that beat and then move to it. Once you do that you are dancing.

Elvis

Rock and Roll is a synthesis of jazz, Appalachian, country and western, folk and spiritual music, with all sorts of other influences over the years, including classical.

We did the Bop and the Lindy here in the San Fernando Valley!

I believe both are acceptable ...but usually rock n roll is referring to music and rock and roll is referring to leaving somewhere. Personally, I always spell it Rock 'n Roll, with an apostrophe. But...