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These were renamed to Stereo Action Charts (30 positions) and Mono Action Charts (40 positions) in 1960. The chart was renamed to Best-Selling Pop Albums later in 1956, and then to Best-Selling Pop LPs in 1957.īeginning on May 25, 1959, Billboard split the ranking into two charts Best-Selling Stereophonic LPs for stereo albums (30 positions) and Best-Selling Monophonic LPs for mono albums (50 positions). The first number-one album on the new weekly list was Belafonte by Harry Belafonte. The position count varied anywhere from 10 to 30 albums. With the increase in album sales as the early 1950s format wars stabilized into market dominance by 45 RPM singles and long-playing twelve-inch albums, with 78 RPM record and long-playing ten-inch album sales decreasing dramatically, Billboard premiered a weekly Best-Selling Popular Albums chart on March 24, 1956. A biweekly (though with a few gaps), 15-position Best-Selling Popular Albums chart appeared in 1955. Initially only five positions long, the album chart was not published on a weekly basis, sometimes three to seven weeks passing before it was updated.
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7.7 Most albums in the Top 200 simultaneouslyīillboard began an album chart in 1945.
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