I think it comes from really liking literary forms. Poetry is very beautiful, but the space on the page can be as affecting as where the text is. Like when Miles Davis doesn't play, it has a poignancy to it.
“That was the big thing when I was growing up, singing on the radio. The extent of my dream was to sing on the radio station in Memphis. Even when I got out of the Air Force in 1954, I came right back to Memphis and started knocking on doors at the radio station.”