Shigeichi Negishi (November 29, 1923 – January 26, 2024) was a Japanese engineer who invented the earliest prototype of the karaoke machine. Using a speaker, a microphone, and a tape deck, he was able to simultaneously amplify his voice and play an instrumental backing track. Although Daisuke Inoue receives more international recognition for a similar invention, the All-Japan Karaoke Industrialist Association recognizes Negishi as the first among five independent inventors of the karaoke machine.
Source: “Shigeichi Negishi”, English Wikipedia (CC BY-SA 4.0), excerpt