You cannot listen to The Dark Side of the Moon without having awe for the achievement in sound engineering especially considering the technology that was used to record it. There was no Garage Band or any other type of sound mixing software back in 1973. This was all done with tape machines. The song "Time" begins with a bunch of clocks ticking with a Roger Waters bass riff and then their alarms all go off. He recorded this by wheeling one of his tape machines into a clock store near Abbey Road studios. He asked the store manager if he could to stop all the clocks and record each of them individually, first the tic-toc and then the alarm. Then back in the studio, he superimposed the clocks onto each using multiple tape machines, one on record and the rest on play.
The next time I play with Garage Band on my Mac, I will be thinking of Mr. Parsons. I was in awe of him before I heard this, now I can place him among the legends. If Billy Preston can be called the Fifth Beatle, I have no problem calling Mr. Parsons the Fifth Floyd.