SilverWook said:
Early stereo VCR's had an audio input setting to facilitate FM simulcast recordings. I could get MTV's stereo audio if I ran the cable into my stereo's tuner back then.
I find it interesting that the circulating bootlegs of MTV's first day are in stereo.
People talk about how only a few thousand people watched MTV's premiere, so it's amazing that at least one of them not only recorded it for posterity, but cared enough to tape it in stereo.