LP record
From The Art and Popular Culture Encyclopedia
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Long playing (LP) record albums are 33-1/3 rpm vinyl 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 in the late 1980s.
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.
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