Listened to Fats on the Black Radio stations ( Going to the River )back in 53 before he was played on the major ones
But Chuck Berry was bigger than he was IMHO
Actually Berry was shunned by the black audiences as too country
BUT the first Rock and Roller was Hank Williams
https://www.youtube.com/watch?v=zZeDVUuRhrw
https://www.youtube.com/watch?v=-Lza3NVH6Ig