How the brash radicalism of Madonna paved the way for cute and cuddly Taylor Swift

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It’s a big weekend in the world of pop, with the two most popular female artists of their generations in action. On Saturday, Madonna launches her postponed Celebration tour in London with the first of six sold-out shows at the 20,000 capacity O2 Arena, kicking off a 78-date global trot that will see her perform to over a million fans.