S & T Trivia
" Roberto del Rosario invented the piano tuner's guide, the piano keyboard stressing device, the voice color tape, and the one-man- band (OMB). The OMB was later developed as the Sing-Along-System (SAS) to aid his voice students. His first model came out in the 1970s, and was copied by the Japanese who named their device the karaoke. The July 24, 1999 Philippine Daily Inquirer reported that Del Rosario filed a suit and was consequently awarded sole authority over karaoke's Philippine production. "