Nobody was more important than Elvis in the popularization of Rock'n'Roll music. Chuck Berry was second most important. Bill Haley, on the other hand, invented it.

Sun sessions? What about Johnny Cash, Charly Rich and Roy Orbison?

If you judge early Rock'n'Rollers strictly by the product they produced, Ricky Nelson cannot be beat. Great songs, fine singing and even James Burton's pioneering lead guitar work. He and Cash I still listen to. Maybe Buddy on occasion.