Great Rock Musicians: Their Achievements and Effect on Rock and Roll The blues are undeniably the roots of early rock and roll. Rock today has mutated so much that the basic blues patterns have been all but lost. The purpose of this paper is to illustrate the birth of, and evolution of rock and roll by focusing on three of the arguably greatest rock musicians of the sixties and seventies. The origin of the blues can be traced to the emancipation of the slaves in the rural black areas of the south, where most of the people worked on share- cropping farms. Musically the blues are defined as a 12-bar chord progr