The OP's list does not contained any Rock & Roll singers. That's what 'caused' me to comment.
R&R was a genre aimed primarily at young juveniles. It was very good for dancing. It was happy and fun and dealt mostly with young people's notion of love / romance with subtle sexual suggestion.
It did not glorify drugs or violence or hate and certainly was not political in nature. The arists did not have to look, act and dress weird or have prison records.
some R&R singers are:
Elvis --- Chuck berry ---- Fats domino ---- little richard --- jerry lee lewis ---- most, but not all of the motown groups. And many more I am tooo old to remember. The genre did not last long before it was taken over by no talented 'bands' that made a lot of noise and looked strange.
I should have been clearer in my post.
Cheers.
