What is some good old rock and roll?

I am already into CCR, Ac/Dc, johnny cash, sabbath, supertramp, joe walsh and so on and so forth. we have an external hard drive with like 100 gigs of music but i cant find it and im missing all of the good old stuff. i was at school and we listened to tons of other stuff but i lost all my music and am trying to piece it all back together.