CD player in 1970. Following litigation, Sony and Philips licensed Russell's patents (then held by a Canadian company, Optical Recording Corp.) in the 1980s. The Compact Disc is an evolution of LaserDisc technology, where a focused laser beam is used that enables the high information density required for high-quality digital audio signals. Prototypes were developed by Philips and Sony independently in the late 1970s. In 1979, Sony and Philips set up a joint task force of engineers to design a new digital audio disc. After a year of experimentation and discussion, the "Red Book" CD-DA standard was published in 1980. After their
Philips Records Symphony Orchestra conducted by Kiril Kondrashin; two albums of symphonic "bon-bons" by the London Symphony Orchestra and Charles Mackerras released as "Kaleidoscope"; "Russian Song Recital" by Galina Vishnevskaya and Mstislav Rostropovich; and Beethoven sonata op. 69 for cello and piano by Richter and Rostropovich. The Richter Liszt album was recorded on 3-track 35mm magnetic film and was reissued on CD from a remaster made from the film by original producer Wilma Cozart Fine, (wife of the late recording pioneer Bob) as part of the Philips Solo series. Classical groups that Philips heavily recorded included the Royal Concertgebouw Orchestra, the Beaux