Spice Girls are the biggest selling girl band of all time. During their short, but incredible chart reign, they accumulated 85 million sales and 9 UK Number 1 singles. Their unprecedented success has ensured they will go down in history at the forefront of female empowerment and icons of the 'Cool Britannia' movement in 90s Britain. To this day, they are seen as one of the most successful marketing engines of all time, with revenues estimated at up to $800million. 20 years from their debut single, they are still one of the most successful acts in history, and have firmly cemented their place in history. This is the evolution of the Spice Girls.