Fifth... Pink Floyd, after "Dark Side." Frankly, they should have gone with their instincts and just broken up after "Dark Side", because after that their music becomes painful to listen to. Every album after the mediocre "Dark Side" is exponentially worse, until we come to "The Final Ripoff Cut" which, frankly, should have been locked in a vault deep beneath the Earth, never to be heard again. And then set on fire. (By the way, I don't even consider anything after Waters left to be real Pink Floyd, any more than the Doors are the Doors sans Morrison.)
Strange you have the exact opposite view of most Floyd fans