Date: January 5, 2012

Music singles have been sold digitally for less than a decade, since 2004, and Rihanna has moved about 50 million of them, making her the best-selling digital artist in U.S. history. She outpaces peers like Black Eyed Peas, Eminem, and Lady Gaga by millions of units. Numbers don't lie, and when it comes to sales, Rihanna is the biggest artist of our time.