BBC NEws:
The first compact disc was produced exactly 25 years ago in a factory in Germany after years of development by Philips and Sony. We take a look at the humble disc's history and how it shaped the music landscape.
-The compact disc project was launched following Philips' failure with its video disc technology in 1978.
-The video disc was one of the first commercial products to take advantage of laser technology that could read information from a disc without any physical contact.
-Research into the video disc began as far back as 1969, and itself was inspired by Italian Antonio Rubbiani, who had demonstrated a rudimentary video disc system 12 years earlier.
-In 1970 Philips began work on what was called the ALP (audio long play) - an audio disc system to rival vinyl records, but using laser technology.
-Lou Ottens, technical director of the audio division at Philips, was the first to suggest that the ALP be made smaller than the dominant vinyl format and should aim for one hour of music.
-Sony and Philips announce their joint taskforce
-The project initially flirted with the idea of quadraphonic sound but a disc with one hour of music had to be 20cm in diameter and so the plan was abandoned.
-In 1977 Philips began to take the development of a new audio format much more seriously. A new name for the product was discussed and names considered included Mini Rack, MiniDisc, and Compact Rack.
-The team settled on Compact Disc because it was felt it would remind people of the success of the Compact Cassette.
-In March 1979 Philips conducted a press conference to show off the audio quality of its CD system in production and also to impress upon rivals how well it was progressing.
-Philips first CD player cost more than £1,000 in today's money
-A week later Philips travelled to Japan after the Japanese Ministry of Industry and Technology (MITI) had decided to convene a conference to discuss how the industry could create a standard for the audio disc. The company left Japan having agreed a deal with Sony.
-Philips' plan for a CD with a 11.5cm diameter had to be changed when Sony insisted that a disc must hold all of Beethoven's 9th Symphony.
The longest recording of the symphony in record label Polygram's archive was 74 minutes and so the CD size was increased to 12cm diameter to accommodate the extra data.
-In 1980 Philips and Sony produced their Red Book, which laid down all the standards for compact discs. From that time on the companies worked separately on their own CD equipment but in the early days agreed to share components.
-In April 1982 Philips showed off a production CD player for the first time. "From now on, the conventional record player is obsolete," said Lou Ottens.
-The first commercial CDs pressed were The Visitors by Abba and a recording of Herbert von Karajan conducting the Alpine Symphony by Richard Strauss.
-US record labels were initially very sceptical about the CD. A year after launch there were 1,000 different titles available.
-In 1985 Dire Straits' Brothers In Arms became the first CD to sell more than one million copies. It is still the world's most successful CD album.
-In 2000 global sales of CDs peaked at 2.455 billion. In 2006 that figure was down to 1.755 billion.