Wikipedia says the patent for karaoke machine is held by a man in the Philippines https://en.wikipedia.org/wiki/Roberto_del_Rosario?wprov=sfti1 https://en.wikip

Wikipedia says the patent for karaoke machine is held by a man in the Philippines https://en.wikipedia.org/wiki/Roberto_del_Rosario?wprov=sfti1 https://en.wikipedia.org/wiki/Roberto_del_Rosario?wprov=sfti... 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 https://en.wikipedia.org/wiki/Karaoke?wprov=sfti1 Besides that I assume any patent from the 70s is now expired.