Long-playing (LP) record albums are 33⅓ rpm vinyl gramophone records (phonograph records), generally either 10 or 12 inches in diameter. They were first introduced in 1948, and served as a primary release format for recorded music until the compact disc began to significantly displace them by 1988. As of 2006, a renewed interest in vinyl has occurred and the demand for the medium has been on a steady increase yearly in niche markets. The long-pla...
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Long-playing (LP) record albums are 33⅓ rpm vinyl gramophone records (phonograph records), generally either 10 or 12 inches in diameter. They were first introduced in 1948, and served as a primary release format for recorded music until the compact disc began to significantly displace them by 1988. As of 2006, a renewed interest in vinyl has occurred and the demand for the medium has been on a steady increase yearly in niche markets. The long-playing record is an analog format. The digital recording of sound was only made practical by the technical advances in microprocessors and computing which occurred in the 1970s and 1980s.
CBS Laboratories head research scientist Peter Goldmark led Columbia's team to develop a phonograph record that would hold at least 20 minutes per side. Columbia Records unveiled the LP at a press conference in the Waldorf Astoria on June 21, 1948 in two formats: 10 in (25 cm) in diameter, matching that of 78 rpm singles, and 12 in (30 cm) in diameter. Although...
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