High Quality Content by WIKIPEDIA articles! Long-playing (LP) record albums are 33? 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 beginning of 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.

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