Premise: Just Dance (song) . The song topped the charts in the United States , Australia , Canada , the Republic of Ireland , the Netherlands and the United Kingdom , as well as reaching the top ten in many other countries . In the United States , `` Just Dance '' was a sleeper hit , spending almost five months on the Billboard Hot 100 before finally reaching the summit of the chart in January 2009 , after being released in April 2008 .
Hypothesis: Just Dance finally reached the summit of the chart in January 2009.
Label: ENTAILMENT