What is the author's tone in Cash: The Autobiography by Johnny Cash?

The story is written in a rambling way that some readers may find to be disjointed. For example, Johnny Cash, the author, returns several times to specific stories, either presenting them with different details or with some slightly different slant. Sometimes, the details and the point remain basically the same. For example, Johnny tells of his devotion to his father-in-law, saying that the two men had become close after Johnny's near-death experience in the cavern. He mentions that his father-in-law is a self-taught theologian and that Johnny greatly respects this aspect of his father-in-law's character.