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 October. The 2009 list was dominated by The Black Eyed Peas and Lady Gaga, who shared the top four spots.
In late December, DJ Earworm released a mashup video to YouTube titled “Blame It On The Pop”, featuring the top twenty-five songs from the list, as he had also done the previous two years for his “United State of Pop” series. The video quickly received four million views in little over a week.