@billpete
I would assume the reason for splitting the album up into two vinyl disks with only two or three songs per side would be to avoid using the inner grooves of the record. The sound deteriorates as the circumference becomes smaller. The linear distance in which the information is carved is much greater at the outer grooves than the inner grooves. So it becomes more difficult carve the same amount of information into a smaller linear distance. The higher frequencies begin to suffer as a result. I believe it is known as "inner groove distortion". Someone such as Allan Parsons, an audio engineer himself, would be aware of that. And my guess would be that he chose to avoid that issue by splitting it into two disks. Thus avoiding the inner grooves for fidelity reasons. That would be my guess.