In the 1950s and 1960s "a third vinyl format" was introduced alongside long-playing (LP) albums, and singles.
The extended play (EP) used the same formats as singles but contained more tracks.
[7] The Beatles had eight different EPs top the chart as did The Shadows (four with Cliff Richard and four on their own).
Conversely, only four acts spent a total of one week atop the chart; Joan Baez, Jim Reeves, George Mitchell Minstrels and Bobby Vee (with The Crickets).
Although official music recording sales certifications were not introduced until the British Phonographic Industry was formed in 1973, Disc introduced an initiative in 1959 to present a silver disc to records selling over 250,000 units.