Led Zeppelin is the greatest rock and roll band of all time in my opinion and it is just an opinion. Just my two cents as far as rock music goes. Seriously, if you are still under 40 or so and like rock music, do yourself a big favor and discover Led Zeppelin if you haven't already. They influenced every rock band that followed to a big degree.
No one could manufacture a man that won 6 French Opens and 5 Wimbledon titles in a row. - Andrew Longmore