Perhaps the greatest thing to ever come from classic rock, which is, in itself great. Southern rock puts a southern spin on classic rock. The guitar riffs are different, using a more honkey tonk style than general classic rock. It is a step between early country, (which was a bit slow) classic rock, (the best genera of music yet to exist) and modern country (which more or less sucks). All in all, southern rock is a great genera.
Southern rock artists include: Lynyrd Skynynrd, and the Allman Brothers