Famously the crooner Frank Sinatra said in October 1957 that:

...the most brutal, ugly, degenerate, vicious form of expression it has been my displeasure to hear—naturally I refer to the bulk of rock ‘n’ roll.

It fosters almost totally negative and destructive reactions in young people. It smells phony and false. It is sung, played and written for the most part by cretinous goons and by means of its almost imbecilic reiterations and sly, lewd—in plain fact dirty—lyrics, and as I said before, it manages to be the martial music of every sideburned delinquent on the face of the earth.

This rancid smelling aphrodisiac I deplore. But, in spite of it, the contribution of American music to the world could be said to have one of the healthiest effects of all our contributions.

So Sinatra - a very prominent voice in 1957 - was against both rock'n'roll's 'actual musical technicality' ("almost imbecilic reiterations" that are "sung, played and written for the most part by cretinous goons"), its 'image' ("the martial music of every sideburned delinquent") and its content ("sly, lewd - in plain fact dirty - lyrics" that "smells phony and false").

I discuss the context of Sinatra's comments in more detail in a reply to the question: In "Let's Get Lost," the documentary about jazz trumpeter Chet Baker, one interviewee says that, growing up in 1950's, he didn't know a single person who listened to Rock 'N' Roll. What teenagers were more likely to listen to jazz than rock in 1950s?