I would say IMO, it would have to be the early EAGLES hands down for greatest, although I loved many of the bands mentioned. Second place for me was Grand Funk Railroad, loved I'm Your Captain. Then The Doobie Brothers. Of course Zepplin, The Stones, Clapton, and Deep Purple, also liked Uriah Heep favorite song "Steelin". There were so many great bands back then, it was one of the greatest times in USA history to grow up. Cheap gas, low insurance rates , muscle cars, and great Rock-n-Roll.