Memes

You have to understand that mixing consoles from that era were supremely limited in channels (think four, eight, later sixteen), to the point where they would often have to mix one section (say, the drums) and then record that mix to tape so it would take up a single channel and then do the guitar, bass, and vocals on another channel. The idea of having two of the same thing going through two channels was an exorbitant luxury they couldn't afford!