Productive management Book

I was pretty excited to read this book, but I was disappointed overall. Disclaimer: This is NOT a book about music history or its impact on history. It is a music critic book. If you want a history book, find something else.
I had seen the author in an interview, talking about the significance of Elvis on gender and image. The first two chapters were very interesting, mostly focusing on the John Wayne/Elvis Presley gender roles for young boys. I thought this was an excellent argument and a good historical argument. The author is not a historian. He is a music critic, a good one, but not in the terms of history. I felt that a lot of his arguments could have been better supported with some historical fact. For example, tying in female rock music and its impact on second wave feminism or how the second wave was reflected in music. Instead, he made more arguments about the different movements and styles in MUSIC rather than the joining of music and history (which to me goes hand in hand). A lot of the connections that he made between different artists or films felt rather stretched, and did not support the connection with more facts or theories. The stuff that he did have enough on, he rambled on and on.
Overall, the book was a little long for the points that he made and it was not what I was hoping for.