By the time Chuck Berry had his breakout hit “Maybellene” in the summer of 1955, he was already nearly thirty years old, with significant experience: he had spent three years of his adolescence in a reformatory for armed robbery; been a boxer and a janitor; worked in an automobile factory and an ammunition plant; trained as a hair stylist and a beautician; been married for nearly seven years; and been industrious and canny enough to purchase a pretty three-room house for himself and his wife, Themetta, known as Toddy. He had one existence chalked up, and was headed out toward several more.