An album is defined by the Official Charts Company (OCC) as being a type of music release that features more than four tracks and lasts longer than 25 minutes;[1] from July 1956, sales of albums in the United Kingdom were monitored by music magazine Record Mirror. From November 1958, album sales were also compiled by music magazine Melody Maker.[2] The biggest-selling album of the 1950s was the original soundtrack to the movie South Pacific.
^Warwick, Neil; Kutner, Jon; Brown, Tony (2004). The Complete Book of the British Charts: Singles and Albums (3rd ed.). London: Omnibus Press. p. viii. ISBN1-84449-058-0.