Rock 'n' roll started with Elvis Presley, the King. Elvis brought ideas of rebellion to the white suburban middle class. His music wasn't new. It had been in the black community for a long time. A white person was not supposed to do it.
He was being a rebel. He inspired many artists to pick up this new/old music style of the time called rock 'n' roll. Some of the groups of musicians inspired to pick up guitars and learn to play the Blues were the Beatles, The Rolling Stones and The Who.