I know exactly what you mean. Someone in the book, maybe Bobby Bare, said he could see the pain in Roger's eyes, or something to that effect. I think his early childhood & everything he lost was why his voice was so expressive. He used it to express his emotions. Here's an example of what I'm saying. (It was in an earlier version of my article, before I cut it out) The italics section is from the book:.
One time after Roger had a fight with his 2nd wife over the phone, he and Don Bowman got in the car for the 30-minute drive to Roger's house. Bowman tells what happened:
...he was humming and tapping on the dashboard. He didn't say a word all the way there. We got there and he got out and walked in the house, picked up his guitar and sang "Husbands and Wives." He had written the entire song over that fight they had over the phone!
Husnamds and Wives is my favorite Miller song