15. Spice Girls
Band Or Solo Artist?: Band
Band Name(s): Spice Girls
Greatest Hit: "Wannabe" (1996)
The Spice Girls are responsible for launching a new pop wave in the '90s. Baby Spice, Ginger Spice, Scary Spice, Posh Spice, and Sporty Spice broke records with their "Wannabe" track in 1996, which hit number-one in more than 30 countries and helped establish the group internationally. Their debut album, Spice, sold more than 28 million copies worldwide, making it the best-selling album by a female group in music history. They're also the best-selling female group of all time, after selling over 80 million albums worldwide.
And if you didn't noticed, they're still in high-demand today. Their performance at the London 2012 Olympics was arguably the most anticipated moment of the entire Games by female twentysomethings around the world.