The patent holder of the karaoke device is Roberto del Rosario, who is within the Philippines. He formulated the karaoke's sing-together technique in 1975 and is recognized as the only real holder of a patent for a karaoke process on earth.[20] Later on developments[edit] Perched up over the 4th ground, https://xn--939au0g6rj1ue34n9rrf5c.online/