Stereo LPs
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Definition
Stereo LPs developed in the late 1940s, replacing the 78 rpm style phonograph.
They were made from vinyl and had smaller grooves than the 78, which required a much finer needle(stylus), and spun at 33⅓ rpm. Stereo LPs continued to develop through the 1950s and became the standard, allowing artists such as Jimi Hendrix and Pink Floyd to experiment with the stereo image.