New Yorker March 28 2022

The History of Mercury Living Presence
The year was 1950. The record industry was recovering from the 'battle of the speeds', which pitted RCA Victor, with its 45-rpm disc, against Columbia Records, inventor of the microgroove long-playing record. (The 78-rpm shellac disc had just suffered a swift demise.) In the aftermath of the protracted struggle, the unexpected happened. Both sides won: the 45-rpm became the preferred speed for popular music at the time and the LP was adopted as the industry standard for classics and other 'long-playing' programs.