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A comment on Apple Introduces Apple Music Sing. Parent comment
It also says that Karaoke in Japan is predated by sing-a-long programs in the US. https://en.wikipedia.org/wiki/Karaoke?wprov=sfti1
Besides that I assume any patent from the 70s is now expired.
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It also says that Karaoke in Japan is predated by sing-a-long programs in the US. https://en.wikipedia.org/wiki/Karaoke?wprov=sfti1
Besides that I assume any patent from the 70s is now expired.