Originally Posted by Dr. Johnny Fever
Of those 3 my answer would be Pink Floyd...... but my choice would be Alan Parsons Project.
We know Alan Parsons was a huge contributor to Dark Side of the Moon. I believe he was credited as "engineer" but from what I've read he was doing alot of the producing due to the new and innovative "sounds" that he brought to the table. He carried that skill on to his own band. Always a front-runner.