How useful is a production of culture perspective in understanding the birth of rock and roll?

The ideas expressed within Peterson's article are effective in explaining the emergence of rock and roll. In particular his use of, what he calls, the six key factors do go some way to explaining this key development in popular music

However, while the changes in law, technology and the industry do explain how it was possible for rock and roll to emerge, they do not explain why.

The rock and roll genre is a complex mix of the genres of the time and the reason this mix became popular is not explained by this perspective, neither can it explain why it has had such an effect on all subsequent musical genres. Also, while Peterson discusses ideas of Showmen and Entrepreneurs, I feel more needs to be looked at performers such as Elvis and Jerry Lee Lewis as this perspective overlooks their ability to make classic pop and capture cultural feeling.