LONDON: British singer Lady GaGa says she is shocked by the success of her hit song Just Dance that took her just 10 minutes to write. Contactmusic.com reports that the song went to number one in six countries and even got her a Grammy nomination. “It’s been unbelievable the way the song has crossed over into the mainstream. It took 10 minutes to write. I think it’s because it’s a happy record. Maybe the record will be appreciated more now there are lots of people who are going through rough times, losing jobs and homes,” GaGa told a British magazine.