"Rolling In the Deep" kicked off Adele's transformation into a superstar. She described the song as a "dark bluesy gospel disco tune." The subject matter relates the feelings of a woman scorned. It was the first single from the album 21 and hit #1 in countries around the world. In the US it spent seven weeks at the top and has sold more than seven million copies. "Rolling In the Deep" also took home Grammy Awards for Song of the Year and Best Music Video.