Gather 'round, children, while I tell you a tale from way back in the dark times. Y'see, before playlists were invented, record companies would often press double albums so that sides 1 and 4 would be on record 1, and sides 2 and 3 would be on record 2. That way you could stack both records on a changer so that when side 1 finished playing, side 2 would drop so it could be played immediately after side 1. Take them off, flip them over, and you could play sides 3 and 4.
The problem was that record changers were mainly used on turntables that were either geared toward kids, or built into massive entertainment units that spanned living room walls. As demographics shifted and those kids were old enough to buy their own gear, they had outgrown their old Sears record player, but didn't want a titanic Magnavox console like their parents had. They opted for simple, non-changer turntables to go with their component stereo. Yet still the record companies pressed double albums geared toward changers. Old habits die hard, I suppose.
Why do I bring this up? Simply because I had forgotten about that little quirk when I digitized a 2-LP Warner Brothers anthology of pop music from 1973 this afternoon. Now I have to cut sides 2 and 3, then paste them between 1 and 4. If that's the worst thing that happens to me this week, I'll be deliriously happy.