The UK Singles Chart is one of many music charts compiled by the Official Charts Company that calculates the best-selling singles of the week in the United Kingdom. Since 2004 the chart has been based on the sales of both physical singles and digital downloads, with airplay figures excluded from the official chart. This list shows singles that peaked in the Top 10 of the UK Singles Chart during 2009, as well as singles which peaked in 2008 and 2010 but were in the top 10 in 2009. The entry date is when the song appeared in the top 10 for the first time (week ending, as published by the Official Charts Company, which is six days after the chart is announced). One-hundred and twenty-nine singles were in the top ten in 2009. Ten singles from 2008 remained in the top 10 for several weeks at the beginning of the year, while "TiK ToK" by Kesha, "Starstrukk" by 3OH!3 featuring Katy Perry, "Don't Stop Believing" by Journey, "Look for Me" by Chipmunk featuring Talay Riley, "The Climb" by Joe McElderry and "3 Words" by Cheryl featuring will.i.am were all released in 2009 but did not reach their peak until 2010. "Broken Strings" by James Morrison featuring Nelly Furtado was the only song from 2008 to reach its peak in 2009. Forty-three artists scored multiple entries in the top 10 in 2009. Emeli Sandé, Lady Gaga, Michael Bublé, Pixie Lott, Taylor Swift and Tinchy Stryder were among the many artists who achieved their first UK charting top 10 single in 2009. The 2008 Christmas number-one, "Hallelujah" by X Factor series 5 winner Alexandra Burke, remained at number-one for the first week of 2009. The first new number-one single of the year was "Just Dance" by Lady Gaga. Overall, thirty-one different singles peaked at number-one in 2009, with Lady Gaga and The Black Eyed Peas (3) both having the most singles hit that position. Background One-hundred and twenty-nine singles charted in the top 10 in 2009, with one-hundred and eleven singles reaching their peak this year. Forty-three artists scored multiple entries in the top 10 in 2009. Chipmunk secured the record for most top 10 hits in 2009 with five hit singles. Chart debuts Sixty-five artists achieved their first top 10 single in 2009, either as a lead or featured artist. Of these, four went on to record another hit single that