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
This Is the Story: The '70s Albums, Vol. 1 – 1970–1973: The Jean Terrell Years period are the three duet albums recorded with Four Tops; these were issued in full in 2009 on the 2-CD compilation "Magnificent - The Complete Studio Duets," which included 13 previously unreleased recordings. A follow-up box set, entitled "" was released in May 2011. It features Scherrie Payne (who replaced Jean Terrell) alongside Mary Wilson, Cindy Birdsong, and Susaye Greene (who replaced Birdsong on the group's final two albums.) CD 1 CD 2 CD 3 This Is the Story: The '70s Albums, Vol. 1 – 1970–1973: The Jean Terrell Years This Is The Story is a box set, released in