The 33 1/3 and 45 RPM speeds represent the rotational speeds at which vinyl records spin on a turntable. The 33 1/3 RPM (revolutions per minute) speed is standard for most LP (long-playing) records, including full-length albums and EPs, while the 45 RPM speed is commonly used for singles and shorter recordings. Each speed has its own groove spacing and playback time, with 33 1/3 RPM offering longer playtime per side and 45 RPM typically providing higher fidelity and better sound quality for singles.
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