Karaoke was invented by Japanese musician Daisuke Inoue, in Kobe, Japan in 1971. He prepared a tape recorder that played songs for a small amount of money, the guests asked him for songs to sing along with.
He then started giving these karaoke machines for lease so that the stores had no need to buy the new songs. It became a fashion at the same time expensive. The karaoke was first used in hotels, restaurants, and soon karaoke boxes with compartmented rooms became popular. In 2004 Daisuke Inoue was awarded the “tongue-in-cheek Nobel Peace prize for inventing karaoke.
Daisuke did not patent the machine and so did not directly profit, but he continued to work in the industry it generated, including patenting a pesticide for karaoke machines