A real how long is a piece of string question, beginning with what constitues rock and roll. iTunes has about 100 different genres it uses to identify music in your library, about half of them could be described as different rock and roll styles. Not that I would hold up iTunes as any great authority, my Album "101 Northern Soul Anthems" is tagged R&B, yet there is a Northern soul genre.
Anyway how about "Smoke on the water"