@Linkat,
Was I the only one to mention Jim Morrison? I gotta look back and see.
I do want to add to the list Michael Jackson. As of the '80s, I feel that he was Rocking (not doing strictly R&B, Soul). My cut-off or line of demarcation, not be your cut-off. It's a line that's is hard to define.
BTW, I actually didn't miss listing Aretha, James Brown, Supremes, Supremes, O'Jays, Lionel Ritchie/Commodores, Earth, Wind and Fire, Marvin Gaye, Smokey/Miracles Otis Redding, Sam Cooke, and Wilson Pickett. I cosndier there hits to be Soul, R&B, or Blues. This music is close cousins but not exactly Rock & Roll in their rhythms.
My choices listed were conscious choices. FWIW, I love all kinds of music, but 'Rock Voice' I define differently than some others here would.