Led Zeppelin and Aerosmith rocked and ruled the seventies but i think that the progressive rock/ art rock bands (Rush, King Crimson, Pink Floyd, Jethro Tull, Emerson Lake & Palmer, Genesis,Queen) were more talented.

LED ZEPPELIN WAS THE COOLEST BECAUSE OF THEIR LIVE SHOWS, THE BACKWARD MESSAGES, JIMMY PAGE'S INTEREST IN OCCULTISM/'MR.CROWLEY' , LOTR REFERENCES but i think that their coolness made them VERY OVERRATED.