This kind of detail I find fascinating.
Doing the Super Bowl show, Springsteen said, led him to discover a “pretty good voice to write in.” With time on his hands after the big game, he kept at it, writing down vignettes from his life in longhand while he and Scialfa were staying in Florida, where their daughter, Jessica, a competitive equestrian, was participating in show-jumping events. He was pleased with the results. In fits and starts, back at home in New Jersey and on tour over the next seven years, a full-blown, 500-page autobiography eventually took shape, with no ghost or collaborator. Every word in the book is his own.
via Vanity Fair