How useful is Peterson's production of culture perspective in understanding the birth of rock 'n' roll?

I have found that Peterson’s account of the reasons for the development, and popularity, of rock music in the 1950’s using production of cultural perspective to be intriguing and informative.
I feel the he demonstrates the symbiotic relation ship between Broadcasting Industries, Record Company and Technology aptly. Also his historical reasons for the rise of any alternative style of music, not to the likening of ASCAP executives, being understated until the 1939 licensing dispute, which of course led to the founding of BMI paving the way for Jazz, R&B, Gospel and Country to come together and form Rock sixteen years later was fascinating.
However there are problems with this article. For example in the introductory foot notes he says that ‘Rock’ will be used as an umbrella term for all forms of rock. Surely there must be some distinction between rock music that comes from a country, gospel, or R&B background? Also he disregards technological developments of instruments themselves, which made recording and performing easier. He also doesn’t explore the changing style of music, referring only to the ‘crooner’ style of the 1940’s.