Roberto del Rosario


Roberto L. del Rosario was a Filipino entrepreneur who established Trebel Music Corporation, a piano company in the Philippines. He was the patent holder of the Sing Along System, a type of karaoke system he developed in 1975.

Patent rights to Karaoke

Del Rosario held the patent to the Sing Along System, a type of karaoke system which he developed in 1975. He filed a patent infringement case against a Chinese company before the Supreme Court. In 1996, the court ruled that the Chinese company violated his patent rights. He was recognized as the sole holder of a patent for a karaoke system in the world. However, most scholars credit Daisuke Inoue, a Japanese, as the inventor of the karaoke. Inoue invented the karaoke in 1971.

Other works