by Kathleen Harrison Sound recordings in the format of grooved discs came into being in the late nineteenth century, but it was not until the late 1940s that vinyl long-playing (LP) phonograph records came into production. LP records quickly became a popular format for sound recordings, especially with the release of LPs with stereophonic sound in the 1950s. While the LP disc has long since fallen out of popularity as a recording format, it has seen a small resurgence in some areas of the recording industry.
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