At the Super Bowl in 2007, headlining performer Prince had absolutely nothing to prove: he was already a rock icon, respected by nearly everyone for his empowering attitude both on and off stage. After getting the crowd on their feet with a cover of "We Will Rock You", Prince performed classics like "Let's Go Crazy" and Tina Turner's "Proud Mary." His captivating rendition of "Purple Rain" — performed in a total downpour — stands as one of the most incredible moments of his career to this day.