 Complete the following phrase:  The UK Singles Chart is a record chart compiled on behalf of the British record industry based on sales of singles in the UK. Since 1997, the chart has been compiled by The Official Charts Company and was based entirely on sales of physical singles from retail outlets until 2006, when digital downloads were included in the chart compilation. The UK Singles Chart originated in 1952, when New Musical Express NME published the first chart of singles sales. The first deceased artist to top the charts was Buddy Holly, who died in 