He wrote an excellent book about the music biz, titled something like "How to Make It in Music". I really liked it because he talked about the biz from the bar band level up. He shared stories of his days booking gigs for his bar bands, all the way through his days as a solo singer with hit songs like "Lucille", "The Gambler" etc. He talked about professionalism in and off stage, business sensibility, being a performer as well as a businessman. One of the best parts is he talked about different approaches and offered even-handed explanation of how different approaches worked even if he didn't then they were the best choices ( as in independent labels vs. major labels back when that mattered)
So even nor being a fan of his solo work, I always had a lot of respect for his willingness to share what he had learned.