You will be given a definition of a task first, then some input of the task.
Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Sentence: An Internet video of six young Iranian men and women dancing to Pharrell Williams ' " Happy " has led to their arrests , showing how far Tehran will go to halt what it deems to be decadent Western behavior - despite the views of its moderate president .<sep>Span: " Happy "
Output:
Is that a popular song?