Billboard magazine each year releases a Top Hot 100 songs of the year, counted from the first week of November to the final week in December. The 2009 list was dominated by the Black Eyed Peas and Lady Gaga, who shared the top four spots. On 27 December, DJ Earworm released a mashup video to YouTube featuring the top twenty-five songs from the list, as he had also done the previous two years. The video quickly went viral, and received four million views in little over a week.
- ↑ "Year End Charts - Year-end Singles - The Billboard Hot 100". Billboard. Nielsen CompanyNielsen Business Media, Inc. http://www.billboard.com/charts-year-end/hot-100-songs?year=2009#/charts-year-end/hot-100-songs?year=2009. Retrieved 2009-12-11.
- ↑ Smith, Mark W. (6 January 2010). "Viral Video: 2009's Top 25 songs remixed". The Telegraph (Macon). http://www.macon.com/248/story/976100.html. Retrieved 10 January 2010.