Back when they recorded these in the studio, they didn't as yet have true multitrack tape, but they did have 2, 3, or 4 track recorders.
I guess you're right though, sounds like way too tough to remove the music on this video. Scott Hi Scott! That is all extremely helpful information, thank you very much! I wasn't aware of the "mix-subtraction" method, that is very cool! I'll have to look up more about that. If I were you, and this were a "commissioned" cameo recording, I'd ask for a re-recording or your money back. Some AI/Neural-network stuff might be able to, but it's not cheap, nor easy to find, nor to use. Had it been digitally mixed in post after the speaker's recording, you could just find a copy of the recording and do a mix-subtraction, but that's not possible with environmental/background music. Because it is in the background, it may have a lower level, and there are "noise gate" apps/devices that can somewhat improve that, but at the possible cost of noticeable pumping of the background acoustics and possible changes to the foreground audio as well. It also has the same acoustical character (based on the space) that the person speaking has, so no way to differentiate spectrally. Something playing in the background, not mixed digitally, would be one of the hardest kinds to get rid of.
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