High Quality Content by WIKIPEDIA articles! A single is a type of music release defined by the British organisation the Official Charts Company (OCC) as having fewer than four tracks and not lasting longer than 25 minutes. On 31 May 2011, a retrospective record chart was broadcast on BBC Radio 2 that listed the sixty biggest-selling singles in the United Kingdom during the 1960s. The programme, entitled The Top 60 Best Selling Records of the 60s, was hosted by British DJ Tony Blackburn. The chart was compiled by the OCC, and was based on sales of singles from 1 January 1960 to 31 December 1969. The most represented act in the chart is The Beatles, who feature on the list with eighteen releases, seven of which are in the top twenty. Similarly, the most represented record label is Parlophone, who released music from The Beatles between 1962 and 1968 in the UK. The most-represented act after The Beatles are The Rolling Stones, who have five singles in the list. The highest-placed female artist is Cilla Black at number 27, with her 1964 single "Anyone Who Had a Heart", which was also distributed by Parlophone. Of the sixty songs in the chart, more than half are by British acts.